As Carl stated, welcome to the hobby and to ORR.net.
Many ladders on RV's are not electrically grounded. That may (or may not) be an issue. And as Carl stated, if the repeater can hear you, you are probably OK. With the line of sight nature of VHF/UHF simplex can be a bit "iffy" which makes it interesting.
One of the biggest challenges to the RVing ham is getting a mobile antenna set up on the RV. Portable is pretty simple, but mobile is something else!
Again, welcome to ORR.net. Unlike some forums, we enjoy having newbies on our boards!