Swagman may be your best option for where you want to mount them. I've been shopping bike carriers, part of which has been emailing the main manufactures for how being on a RV effects their warranty. Virtually all except Swagman have said they don't recommend use on the the back of RVs. With having a fifth wheel I'm working on a pinbox mount to put them on the front, Kuat and Hollywood Racks have both said their lifetime warranty would not be effected.
Swagman has a link on their website to the racks they recommend on RVs
