I purchased a 2007 Fleetwood Revolution LE with 42k miles on it for 99k, put down 12k and financed the balance for 15yr @ 4.5%. It was a bank which I had no relation to but do have a high income and IRA's which each would cover the loan if needed. That isn't everyone but yes it can be done, just do a lot of searching and possibly consider consignment selling through a good dealer.
I plan on doing my 2007 Fleetwood Revolution LE with 1 strip down both sides of the coach. I will be ordering the aluminum channel with opaque cover from Banggood.com along with the LED strips. Once I get into starting this project early next year I will post pics and a full description of my work.