Do you have to stay where you are. There are a lot of cheaper states to live in, other than California.
If you have a lot of trailer parks in the area, check them out, drive in and talk to the folks. If stuff is scattered about, and your a neat freak, it might not be the place for you. Ask if the laundry is maintained or down a lot. See if there is propane service or if you have to take them to be filled. Ask about the Wifi. Usually in parks they just aren't real dependable so you might have to get your own hotspot. Do they have cable or can you use an antenna.
The TT is the answer but don't get a cheap one as it will cost you more money in long run as they are not well insulated and staying warm or cool will be an issue. What ever you get, INSULATE as well as you can. Reflective paper or plastic on the windows, rugs on the floors, anything to keep the heat or cool in. Check out the awning and use it, except in windy or stormy weather
Your going to really downsize but that isn't a bad thing at all.
My friend is in your situation and he makes a game out of saving money. He uses one grocery store and only gets what's on sale. His refrigerator broke so he just got a cheap brown one and its doing him fine. He lives in Portland so he used the antenna to get TV
I am not sure that living in a TT is any cheaper than living in an apartment so do the math before you decide.