For a basic vent that just allows air to flow through I recommend the Ventline E-Z Lift Ventadome Trailer Roof Vent # V3092-603-00, but if you're wanting more of a high-end setup I really like the MaxxFan Deluxe Roof Vent w/ 12V Fan and Thermostat # MA00-06200K since it has a 10 speed fan and a that so you can keep the vent open during rain and travel.
These are designed for a 14" x 14" roof opening so you'll need to box in your current opening for either of these to fit properly. The... view full answer...
According to Lippert, the correct replacement gear motor for your Power Gear 524664 is part # LC368221.
I've linked to a product description video for the replacement gear motor. view full answer...