John,
That's what we have been doing until now
Tent has a lot of advantages, it gives you a freedom to do what you want, no limits. But there are those trips down the ladder in the middle of night...
Anyway, our experience with Maggiolina by Autohome:
Fiberglass pod, about 50kg, requires Rhino type roof racks. Super easy opening with a handle - you wind it up and it's ready in under a minute. Your bed is always made up - no fuss. Folding it back takes about 5 minutes as you need to go around couple of times to tuck the canvas in.
It is aerodynamic and fairly light, but our fuel consumption has gone up by about 10% at steady 100kph (11.5 to 13)
No annex room available, so you are hitting privacy limits with changing etc. We have solved it by purchasing one of those instant shower tents for $45. They expand automatically and it takes 5 seconds to fold them back once you've mastered the method...
I've heard about marriage breakups caused by this thing.
They can be used as a change room, shower and a toilet - pretty neat for the money.
Autohome is quite expensive though, mate of mine has bough an ARB rooftop tent for less than half price complete with annex room. Initial reports are very positive, he's a happy camper!
Cheers
Peter