Couple of thoughts here. I have been camping for most of my life
done both tent & tent trailer as well as backpacking.
I think that anything purchased would have to be for normal use as well as an emergency.
One problem that I have with tent trailers is they do take more time to set up and once you set then up you tend to not want to move them. But the comfort over sleeping on the ground in temperent conditions make it worth it.
As for getting in and out of inaccesseable areas the altimate all teraine vehical is your own two feet, you can go places nothing else can.
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Ward