Nice job.
I would suggest the 1 part marine enamels for this application (such as Interlux Brightside). We did the topsides on our boat about 12-14yrs ago. Sold it after 4yrs and it looked perfect and shiny with no buffing or waxing, just an occasional wash.
The advantage the 2 part is they are more abrasion resistant...which shouldn't be an issue on an RV. Boats on the other hand are walked on and have fenders constantly rubbing the sides, bump into docks, etc...
The advantage of the 1 part is it's a lot easier to work with and if you do need touch ups, you can keep a spare quart and a sponge brush and 30 seconds to cover a scratch.
