I'd been wanting to get into something like 1/87 TableTopTrialTrucking for years, but luckily nobody i know of in into it, and i'm not close enough to anybody with a nice train layout to go play at their house.
Probably would mostly turn into building terrain dioramas to take to 1/14 meets just to show off a truck while not driving the "big" vehicles.
China company making parts to play tiny trucks like the Germans.
https://www.dasmikro.com/
Any of the message boards i've found about HO-scale RC are in german, except TinyRC but i think it's been zombie dead for a long time. Probably either have to run through a site translator, or realize your deutch ist nicht sehr gut.