What I did to reduce the number of keys to keep track of was to use Strattec BOLT locks for the hitch pin and padlocks. They key permanently to your vehicle, so just keep them with the truck. That way, the hitch receiver pin, the padlock for the hitch latch, and the padlocks for the BAL X-chocks are all on the same key.
For the compartment doors, I went with a generic "automotive grade" FJM key. Better than the CH751 since it is less likely to break off in the lock. That gets me down to two keys just for the RV... the door key and the compartment key.