Fuel ain't cheap, so it might not always be a economical to send larger haulage units out on a job. Sometimes a small, run-around cargo-tug is all you need (or can afford). Much easier to park too...
1 polyurethane castings - a smaller, workhorse hovertruck with an enclosed rear. Available in an open back version here.
For a little information on working with resin see this page.