camper to park model

Realistically, I think a mobile home would be a better option if you can possibly swing getting one by any means. It will almost certainly have more space than a travel trailer, be better insulated (and so potentially less costly to heat and/or cool--but the larger size does work against this), come with a residential refrigerator (which uses a good bit less electricity than an RV absorption fridge running on electricity), and just generally be more satisfactory. The kitchen appliances etc. will be more standard sized for residential use, the electric system designed for all the typical household loads, the wall framing somewhat heavier, the plumbing fixtures normal-sized and probably not all plastic, the kitchen may well have some actual counter space, and so forth.

I understand that this might not be possible to do financially, and in that case one needs to do what one needs to do. In such a situation, I would probably see about getting the lowest cost travel trailer I could find that would suit the purpose (which of course means it's in reasonable overall condition and not leaking), and plan to do as little as practical to it to keep it workable while saving up for a "real' mobile home. If that means toting propane cylinders to be refilled, so be it.

Good luck with whatever you end up doing. I hope everything works out well.