I find the biggest drawback is the potable water.... and I hold 150 gallons... but I have to watch the use, with showering etc when I'm on a 6 day trip. Two out to track, two at the track, and two back home. I could go 7 days... but that's it.
Finding water and being able to hook up and get some is the biggest problem. But then - "the rig" is a little larger and is harder to just pull in some place. You can at least go to a camp/mobile site for the night - where I can't get in them.
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