Another factor to consider is your comfort even for a short trip. Do you want the convienience, comfort and safety of sleeping inside with heating and air conditioning or do you want to sleep on top of or along side your vehcile in a tent?
Have you driven a mog, what model are you looking at? A 'mog' is a range of vehicles spanning nearly 60 years in an untold number of configurations. They are not for everybody and depending on what model you are looking at you get various levels of comfort, noise, AC etc. Unless you are looking at a U500 they are not the best trucks for road driving, if you spend 75% of the time on roads there are better big trucks. On the other hand a U500 is not as good offroad as some its older borthers, say a 416 or a 1300L. Its all relative, by comparison to most vehicles a U500 is remarkable offroad and compared to vehicles its own size its untouched. When you consider a camper U500 is plenty capable for anything you would want to drive over with your house on the back.
In general their foot print is not that big, my 416s are barely any wider than a full size dodge and have a shorter wheelbase. If you consider most mogs can turn on a dime they are better on switchback trails than pretty much anything - a 416 has a significanlty tighter turn circle than a tacoma:
Domestic (track widths - is this the outside?)
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Tacoma 44 feet
Tundra 44 feet
FJ Cruiser 42 Feet
Dodge Ram 50 feet
Ford Ranger 46 feet
F150 46 feet
Unimogs (outside circle)
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u404 42 feet
u416 38 feet
u1300 38 feet
u406 32 feet
u421 29 feet
u500 42 feet
Rough roads are fine up to the point you can no longer call it a road, narrow canyons are fine as long as they stay fairly level when its really tight. Its basically overhangs and trees that cause the problems which may or may not be problems depending on where you go. In the desert not a problem, South American jungles will be a problem at some point.
On the rubicon a mog camper, even a small one, won't fit. In general the Rubicon is fairly easy in a mog, the old round cab mogs (404,406,416,421,403,413 etc) just fit through some of the tight spots and even then you have to pick a good line otherwise the off camber angles will catch the cab or bed. Even if your camper was the same width as the cab you would wreck it and the higher center of gravity would cause problems. Any later mog be it a u1300 or a u500 has no chance, its simply too wide regardless of what you do it.
Rob