I believe A Janitor's maps "Bob's Revenge" and "Planet X" have bins with modified proportions so you can fit these kind of stuff you're talking about. "Moppington Subway" has a working train with a lot of space inside.

Also small stackable objects like the medical crates, med-waste and cryogenic canisters fit in a regular bin leaving space for at least one more. Not much but it still cuts a lot of time walking around.
And launching objects with force is really easy to do, allowing you to transport many crates at once if you will.

I know, but if you were with friends then they could fill boxes and you could drive them to a drop off and incinerate them with a high level of efficiency.

thats a cool idea like those miniature utes/pickup trucks one finds at a big shopping mall usually its the gardeners maintenance vehicle its like an atv with a tray

a small ute to fit one bin and one bucket in the tray would be cool
but only for outdoor maps or large enough area to drive it into an elevator n drive around on another floor=try not to run over corpses or blood as clean dirty tire tracks
2 of these in a map like garbage night would be fun in multiplayer could race eachother or play smash up derby and explode the vehicles creating even more stains and car parts to cleanup

kinda like homer in simpsons hit n run damage the car and get out and it explode
a miniature version of cletus's pickup truck
sise of a golf buggy
drive really crazy and the bin and bucket fall out or roll the vehichle like the warthog in halo

if was really creative a forklift and a pallet to put stuff on like the j-harm to reach the ceiling in athenas wrath?