The trailer is a good idea. As a work vehicle you often end up with the same paint fumes/toxics inside your ride that you have been breathing and splashing on yerself all day.
My mentor has a really nice BIG ford van, powerstroke diesel that he has had and rebuilt since the eighties. (BTW, the napa-crap valve keepers failed less than 3,000 miles after the first rebuild, and the originals went back in after it dropped a valve.) 15 MPG diesel, precombustion chamber so it did pretty good on cooking oil in warm summer climate. New heavier springs now so it doesn't wander and bounce out of the lane anymore, goes straight down the road and had a firm ride with a huge load in addition to GVW. I think it's going to be straight from the pump diesel since the last fuel distributor went in a few months ago. it will be a million mile van I figure...
Look for it at Barber, one with a big pipe bumper that sticks out three feet, designed for loading BIKES.
BTW, these battlax tires are still available ,,,