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 hovertug and a single piece, high resolution resin 3D print of 4 universal carrying crates that fit neatly on the rear.
For a little information on working with resin see this page, and for information on working with 3D prints, see this page.
Available as an enclosed version here.
Also available as a download to 3D print at home here.