We're kind of in the same boat. I just retired in January, and we're going to hit the road for 4-5 months a year starting in June. We just bought this fiver and so far, we're very impressed with it:
Grand Design ReflectionAs for safekeeping important papers and valuables are you talking about home or on the road? For the house, we had a Liberty safe delivered this week to protect important items from fire and theft. It's expensive, but gives me good piece of mind.
I have no clue about camping/parking fees in your area, but I'm sure somebody on here will have some ideas.