the beds aren't cold even though they hang over the edge.
The reason I suggested an FC is that the "erection" is easy. Pull up, un-hitch, pull back the cover, lift over one bed, lift over the other, pull down canvas, adjust poles (5 each side, push-button ones), velcro canvas round. We've removed the wardrobe unit, but you would do that now, then attach sink, attach cooker, attach shelf unit.
That's basically it. You can travel with the sleeping bags and pillows on the beds. There are many cupboards and a fridge, too.
Has your DH actually looked at FCs and their "erection"? You don't need a huge car to tow a Pullman. We've only got a Zafira because there are five of us, but people tow them with Focuses. They really are a doddle to tow. I tow when we go to France. Because they're not higher than a car that's what makes them easier to tow. You don't need extra wing mirrors on the car, either.
My DH kind of had to agree as it's the only way we could afford to go on holiday where the sun is almost guaranteed to shine.