I think a regular caravan trailer would be great fun in this game. Mythbuster made a simple flexbody caravan for RoR long time ago and I think that it would help with the basic idea for the node/beam structure. And a pic just to see what I mean. Because Top Gear
The problem with trailers right now is they aren't set up to use a separate CPU core than the main vehicle. Until then (it is on the devs' to-do list), trailers just murder framerates.