Full Time RVers using mail forwarding and Denied Credit

With credit cards one can have both a physical address and a billing address on file.

Call up the CC company's customer service and give them an address for the physical address that they require (it could be the RV park that you are staying at for all they care), then tell them that you have a separate billing address and give them your mailbox's address.

I've already gone through this "Patriot Act" stuff with my credit cards. I did the above. My PMB is my billing address.

Don't sweat it.