I Don't Trust Suppliers Who Claim They Can Do Everything
If a vendor tells you they can handle all your needs, that's not a promise. That's a warning. I've been managing purchasing for a mid-size excavation company since 2021, processing about 60-80 orders a year across a dozen vendors. In that time, the closest I came to a costly mistake was with a supplier who said, 'We've got you covered on everything.' He didn't. And I let my own eagerness for convenience almost override my judgment.
That experience taught me a lesson that I now apply to every RFP: true expertise has boundaries. The best supplier isn't the one who says yes to every request. It's the one who says, 'This isn't our strength—here's who does it better.' That kind of honesty is rare, and it deserves your business.
The 'Everything' Vendor Who Knew Nothing
In early 2023, we needed to add a Terex crane to our rental fleet, along with a Terex jaw crusher for a recurring crushing job. I reached out to a regional equipment supplier who advertised itself as a one-stop shop. Their website was impressive—a huge inventory, parts diagrams, financing options. They also sold accessories like tow straps, receiver hitches, and, I'm not kidding, truck nuts and lift kits for squatted trucks. That should have been my first red flag, but I was in a hurry to lock in a rate before our busy season.
When I asked for specifications on the Terex crane, the sales rep fumbled. He couldn't tell me the maximum load at a specific radius. He couldn't explain the difference between a boom truck and a lattice crawler. And when I asked about the Terex jaw crusher, he told me it came with a 'standard conveyor'—it doesn't. He kept saying, 'Don't worry, we can get you whatever you need.' But he didn't understand what we needed, because he was trying to sell everything to everyone.
The more products a vendor carries, the more diluted their expertise becomes. That's not an insult. It's arithmetic.
I pushed back. I asked for load charts, service intervals, and a list of trained technicians. He promised to email them. A week later, I got a PDF with the wrong model number. When I called, he said, 'Our system shows those are interchangeable.' No. That's like saying a pickup truck and a semi are interchangeable because both have wheels. (That's the moment I started writing down every mistake, because I knew I'd need them for a future explanation of why we switched.)
Why I Finally Trusted a Specialist
After that dead end, I contacted an authorized Terex dealer. The difference was immediate. The sales engineer asked about our job sites, our permit weight limitations, our fleet's maintenance capacity, and how many hours we'd actually run the crane per month. He recommended a model I hadn't considered—one with a slightly lower max capacity but a much better roading setup, which meant we'd save on permits. Then he said something that stuck with me: 'If you were looking for an all-terrain crane for rough terrain, I'd point you to a different manufacturer. We don't pretend to be the best at everything.'
He lost that particular upsell but won every future order from us. That's the moment I understood the power of expertise boundaries. A specialist who acknowledges a competitor's strength isn't weak. They're filtering out the jobs they can't do well, which makes every job they do take more reliable.
We didn't have a formal vendor evaluation process back then, and that gap nearly cost us six figures. We were about to sign a lease for the Terex crane that the generalist couldn't even service. He had no factory-trained technicians, no specialized diagnostic software, and when I asked about warranty coverage, he said, 'We handle warranty claims through the manufacturer—you pay upfront and we reimburse you after.' Spoiler: that's not how authorized dealers work. Our actual Terex dealer later walked us through the warranty terms line by line and explained that service by unauthorized technicians can void certain coverage. That's the kind of detail you only get from a specialist.
It was the third time we'd nearly made a similar procurement mistake, and I finally implemented a verification checklist. Should have done it after the first. The checklist includes three questions: Can the vendor service what they sell? Are their technicians certified by the OEM? Can they provide proof of warranty terms in writing? Since then, I've saved myself a lot of headaches.
Think about the Terex brand itself. They don't try to be a low-price generalist. They build specific machines for specific jobs, and they back them with a network of dealers who are expected to know those machines inside out. Terex's own website (terex.com) points customers to authorized dealers for genuine parts and service. That focus is exactly why a Terex dealer can train technicians thoroughly and stock the right parts. When a manufacturer knows what it isn't, its channel partners know what they are.
The 'Squatted Truck' Test
Here's a simple heuristic that's served me well: a supplier who sells anything related to squatted trucks—or truck nut accessories, for that matter—shouldn't be in charge of your Terex crane's maintenance plan. You don't need to be smarter than a fifth grader to see the mismatch. It's tempting to think a vendor with a huge inventory is more capable. But the reality is the opposite: specialization is what allows deep knowledge. A surgeon doesn't also sell you vitamins. A Terex dealer doesn't offer to upgrade your pickup truck's suspension.
I know I'm using a silly example. But it's not really silly. The sales model that pushes truck nuts and squatted truck kits is the same model that pushes 'we can do everything' in heavy equipment. It's volume-driven, not expertise-driven. And when a supplier's primary skill is moving inventory, your complex equipment needs become just another SKU in their warehouse.
It's tempting to compare unit prices, too. But identical specs from different vendors can result in wildly different outcomes when support and training are included. The generalist may quote $2,000 less on a daily rental, but if the crane sits idle for three days because their mechanic can't troubleshoot a fault code, you've lost more than the savings. In Q1 2024, we compared quotes from four suppliers for a Terex jaw crusher rental. The price difference was 22% between the cheapest and the specialist. But the specialist's maintenance response time was 8 hours, while the cheapest had 3-day average response and no after-hours support. The 'savings' would have vanished within a single breakdown.
What About the Convenience Argument?
I know some procurement people will say, 'Dealing with one vendor for everything saves us time.' I used to say that. But convenience isn't the same as reliability. When you consolidate purchases with a generalist, you're not saving time—you're deferring risk. The time you save on paperwork comes back as downtime later. (Trust me, nobody remembers the vendor who saved you an hour on Friday. They remember the crane that wasn't ready on Monday morning.)
And here's where the 'are you smarter than a 5th grader?' thing comes in: if you ask a supplier about their weak spots and they can't name one, they're lying to you or to themselves. A specialist will say, 'We don't do X, and we don't want to learn it on your dime.' That's not arrogance. That's self-awareness. And it's the most underrated quality in a B2B partner.
I'll also note that the generalist's pitch usually ignores the cost of poor outcomes. They'll say, 'We can source any part'—which means they'll order it from a third party and mark it up. They won't say, 'We have no technical depth to help you install it correctly.' The phrase 'we can source anything' is the corporate equivalent of 'you don't have to be a rocket scientist.' And you don't need to be smarter than a 5th grader to know that sourcing is the easy part; supporting is the hard part.
Final Thought: Boundaries Are a Feature, Not a Bug
My position hasn't changed since that near-miss in 2023: if a supplier claims they can do everything, assume they can't do the one thing you need them to do well. I still buy from vendors who openly tell me what they're not good at—and then tell me who to call instead. That behavior has never steered me wrong.
That doesn't mean I'm championing narrow-mindedness. A good specialist should know enough about adjacent fields to identify problems. But they don't try to solve all of them themselves. That's the line between professional and poser.
So the next time you're reviewing bids, ask each candidate: 'What shouldn't we hire you for?' If the answer is nothing—if they're a generalist who sells everything from Terex cranes to truck nuts—run. You don't need to be smarter than a 5th grader to know that real expertise comes with limits.