That's quite the juggling act.
I'm rural, and most projects were 70-120 miles away, so I picked up a ultralight 24' camper and just found RV sites close by.
Was a second home, actually spent more time in the camper than home.
What you are doing is not easy, and takes a LOT of in depth system knowledge and maintenance to keep everything reliable.
Did swap out the WH to dual power, when hooked up to a site and both gas and electric enabled, it recovers instantly.
Didn't want a insti-hot because sometimes I only had 20 minutes to drop, set, and shower before the day started, and after driving half the night wanted a hot shower without waiting.
Yeah I have previously entertained the idea of a winter use trailer. Also thought about the idea of a very small camper trailer to drag around full time, but I don't like that idea too much. I'd rather drag the bug around and have something else to drive.
Also considering a 7x9 canvas tent with 6' 3" center height for around $500 with tax. It's 66lbs total but about 1/4 of that is just the poles and stakes.
I bought a 10x14 one last winter but it's 96lbs and much larger packed up. Too big and heavy, just for me and Lucy.
Here is the 7x9. The $475 one has extra windows on the white sides.
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I got the lower priced 10x14 and it's lacking in ventilation for changing winds, so I think I'd get the one with the extra windows in 7x9.
Basically something I can have for an "out building" where I can stay if I don't want to be in the dark van all day, even if it's raining.
That's what I wanted to use the 10x14 for, but it's just too much to unpack and pack every two weeks or so, all summer long.
It's in the cargo trailer right now, and will be set up again this winter while I'm insulating and building the van inside better. I'll be flat out living in it for a week or two, depending how long it takes, depending on the weather.