shoot I got an old scratched up, paint faded, getting rusty, dodge cummins diesel and I do just fine. I also have a couple signs on my trailer with my company name and number. I know of only one successful lawn company (besides Scotts or TruGreen) around here that drives around in a Post-2005 truck, and hes got a brand new silverado. Everybody around here just drives their old beat up work trucks.
If it works good mechanically, I would say run it! But thats just my area, I reckon.
My set up:
-2007 Chevy 2500hd 8.1l 4x4
-7x18 enclosed trailer
-Grasshopper front mount 61", gravely 52"
-36" Gravely Walkbehind, 21" exmark push mower