I did borrow one a few years back and enjoyed using it. I found PLA and abs quite easy to use but they were not quite strong enough for what I needed at the time. I tried some nylon but I couldn't get the results I needed - lots of warping and stringing. I was using a Prusa mk2s and it seemed to print well but thought it would have benefited from an enclosure and a dehumidifier for the nylon - but it was only borrowed so I couldn't go to that expense.
I do fancy the latest version the Prusa (I think it is the mk3s+) and hope to get one early in the new year, so if you have any items you would recommend then please share.
I think 3D printers are great but if you something stronger then laser sintered nylon is good, but expensive for single items - great however if you want multiples.
If you print other items for the truck, please post them on the forum as it would be good to see what people use them for.