We replaced all the 751 locks on our Montana with the Tubular cam locks from Industrial Lock and hardware. We used their guide that you can download to order the correct sizes. Nice thing about them is you can get them all keyed alike. Here is the link to the website:
https://shoprvlocks.com/product/tubu...1-replacement/. The nice thing about ordering from them is they will key a later order to the same as the first. We tried them out on some of the doors and liked them, so we replaced them all. Wasn't aware of fire codes so i put them on the propane doors.
If necessary i can leave them unlocked when parked.