Make sure you have a cover made for RV use don't just cover it with a blue tarp. My Dad has rebuilt a few that have been covered with a blue tarp or similar tarp they don't allow the RV to breathe & cause dampness & mold. The front & rear cap are areas the are likely to leak depending on how they are manufactured.
On through the roof vents & other items through the roof clean the roof real well & bed your covers in window putty then caulk with a good RV caulk & then if your using mop on style roof sealer on a metal roof coat the through the roof covers once again over the caulk. This gives 3 seals & you should not have a problem with leaks. Dad did this on several RV's that he repaired as well as his own & never had an leaks. I did it on 2 mobile homes & never had any leaks.
"Forget the flat stuff slap something on the spinny thing and lets go, we're burning daylight" Bart Leetch
"If it ain't round you may be a knuckle dragger""Turners drag their nuckles too, they just do it at a higher RPM"Bart