i think it would be cool if the seatruck cabin from below zero was brought back, with a customizable cabin rather than a bunch of smaller ones, being double the length of the original modules should work, it would also be coold if you could have a double sided coupler so you could have a seatrain and then for example, if you and a buddy are running from an enemy but your slow, you detatch as two busses to increase speed (you could even use the “back” cabin as another engine to push bigger loads,ie 4 double size cabins and a single size storage for batteries with a coupler in the middle which could be just a walkway, have controls only work from one side until decoupled by having the door to controls close on whatever side isnt sat in, bonus if you can have a train cabin style window layout so you could make rooms,train cabins,labs,pet rooms,storage whatever you could do in a normal base.