I would say definitely go for it if you can make the winter modifications. I can't help there as I stay mostly in the south. However I looking at this information in case we decide to do in travels during the winter to colder climates.
We are doing very similar as I became disabled and lost my job. We have the wife's income all done through the internet and my disability when it kicks in hopefully very soon. We had a rough time including bankruptcy and the last thing I wanted to do was throw away 1300+/mo for and apartment or renting a house. So we used some of our last funds to get a used trailer and even though we have had to fix a few things it was worth it. We have a place to park it in Houston with electric, water and sewer free of charge (Thanks to parents) and we are going to travel around to different CG's and RV parks for at least a few years to save money.
We still have some of the same expenses whether we have a house or not like food, medical, and insurances. We will have a certain amount of up keep on the trailer but we try to due some of the repairs our self.
All in all we like it and are looking to the savings. I wish you well in your journey.