This would be one couple buying and owning the rig. The already have a truck for their massive horse trailer, so that isn’t an issue.
Toy hauler might have its appeal since he has a Harley.
A private room with a comfortable bed, private half bath at least and a couple of recliners would go a long way toward preserving peace.
Still not sure I’d do it, but if they enjoy it, good for them.
I’d go for trip where we both had a rig and even stayed at the same places and collaborated on meals, but it would be awfully nice to step into your own home every night and to have our own transportation so we could see and do what we wanted. Even if it ended up with the women going one place and the men another.