I love,love, love the military 2.5 ton trucks, all the way from the CCKW to the M44 series. A lot. Best truck evah.
However, I also accept their limitations and what they're good for and not good for.
They're slow as heck. Slow to get to speed, slow cruising speed.
They're stiff and bouncy.
They're hot in the summer.
They get bad fuel economy.
They go through tires fast. Especially when used on paved streets.
So all that being said, they're a terrible vehicle to use as a commercial venture like this. I was going to type all this up and post it in the A3.bbq truck thread but I got lazy. Maybe I'll just copy and this.
I used to own a pickup as a daily driver, sold it and bought a Civic to save money (I drive a lot). I figured I'd just use the deuce whenever I needed a truck (home depot runs, etc.).
It's turned out to be kind of a pain in the you know where.
Whenever I want to take it, I have to pre-flight it and make sure it's safe. Then, it's hot as ****. If it's far away, it takes twice as long. Whenever you get to the destination, wait 5 minutes for the turbo to spool down.
And after all that, the only benefit is maybe some PR or advertising gains for the business because the truck is unique. That'll wear off quickly and loooooong before the truck becomes more of an annoyance.
If I were going to do what you're thinking, I'd have a 3/4 ton Diesel truck or a Diesel dually pulling a BBQ trailer. Absolutely the only way to fly.