Who would buy the truck and who would buy the coach?. If 1 trailer, a large toy hauler modded to meet their needs (large rear bath, convert garage to bedroom, rear LR set up. A downside would be if rear door is set up to use as a patio, outside access only. Perhaps a toy hauler that has a side patio? Kitchen and main living area adequate for all 4 adults? Would each couple share in the RV expense in event of a problem and share driving duties? I know 2 couples that rode in a Caddy from CNY to the Grand Canyon and western states (some 5,000+ miles if I recall right) and this was not the big Caddy either (remember the late 80's early 90's Caddy's?). Well they survived, so it can work.