Wildtoad gave a less than complete answer.
Yes,
Too Much
Too Much
Oh Yes, As soon as you see water damage (with distinctly few exceptions) that unit is toast. I have even seen them collapse under their own weight.
You are reading Chicago adds. If that is where you plan to stay, an RV is not the way to stay there. You will freeze you gonads right off. in two months there will be NO RV parks open and even if there were, the monthly rate would be 4~500$us PLUS Electric....
I hate to stomp all over your dream, but I would rather that then have you get into this and have the whole world stomping on you.
Matt - Had a similar plan 50 years ago