You don't need that bit of plastic, when we were younger we used to crash out in the back of the LWB Landie, these newer one's have certainly gone large surely you could manage that

with some of this

onboard..
Ours is a 90" Hardtop, It's a great vehicle and we love it to bits but I wouldn't consider trying to sleep in it. On the other hand there's loads of room in it for storage boxes and the like so we wouldn't need to have so much stuff in the caravan. It being so small means we could drag it to some of the more out of the way places, especially in Scotland. You can get rear tent awnings for them too, so you end up with a decent amount of space.