Truck campers -- awesome, right for a family of 4?

I have 2 kiddos and we found our truck camper to be too cramped so we switched to a travel trailer. There's definitely pros and cons to each as many have noted. I don't have a slide on my Lance either which would make a huge difference. Btw, I can't believe that Host is a truck camper, that thing is HUGE!

In terms of mileage I have an 05 Ram 3500 DRW. The Lance fully loaded approaches 4000lbs. and I get around 10 mpg. I'll bet a new Dodge would do a little bit better.