I have an old camper van sitting on a plot of land just rusting away. I've thought about bringing it home and grow pimping it out but it would be an eye sore, limited in the vertical space and lacks good insulation. That trailer sounds like it would've been a deal, too bad you don't have the space for it.
There should be a good reality show on MJ, kinda like moonshiners but with weed! Ha!
Is the .25 water RO? Sounds a good deal better than .37. I only went there a few times when the local spring was broken and I wasn't going to the mountains. Having the unit outside of the tent would be ideal, like you said, have hoses go where you need them. Units like that may be available, at least heat/AC and dehuey or is it Huey...? I've been getting by but only recently dialed it in real good, the key was the under rug heater, no lower than 68 since.