i think it comes down to one issue:
if you want to be able to use a 4x4 to go off road, reliably, then you must give up a heavyweight camper.
people dont like to admit it but i really think that most campers that you see ....and i do mean most....exceed the specified payload weight of the truck carrying them.
lets face it, a 3/4 truck is rated, by specification, for less than 1500 pounds. in fact, most full size american trucks can only tolerate a percentage of what you think they "should" be able to carry. other trucks are restricted further. a one ton truck cannot carry a ton + wife, dog, water, beer, ice, bedding, bicycle, etc.
that alaskan will need a dual wheel truck as will a lance etc. look at the weight!
dont forget that it is of no value to work with the dry weight of a rv.
dont forget that the tires have a load limit.
in fact i think its almost a conspiracy of sorts that the rv industry is so careful to facilitate the sale in spite of violating vehicle payoad limits.
wink wink yeah sure that'll fit fine!
i dont care about the "light weight" 2100 lb lance on a 3/4 ton truck...it wont be fine when its loaded.
you'll find that even with the little fwc units a lot of owners have to beef up their suspensions, especially on the light trucks. these things have a dry weight of only 750 pounds!
and just because some overloaded yahoo says " i dont have any problems" with the 12' camper with a shower, grey water tanks, etc on a little toyota does not mean its a "good thing to do"
it is risky
start with your truck, figure out the reality of what it can carry safely, and try not to exceed that.
when your out in the middle of nowhere it is really good to feel safe about taking that rock strew narrow goat trail. you wont feel good about it when your drivin the 'tilton hilton and the tires are overloaded and the 300lbs of water is sloshin' around and the suspension is creakin and each pothole causes the overloads to contact the frame.....and rant and rant
whew!
too much caffein!
my nickles worth.