I changed all my external compartments to these
https://www.amazon.com/Combi-Cam-7850R-S-Combination-Chrome-Finish/dp/B001DI059Y/ref=sr_1_1?ie=UTF8&qid=1505106550&sr=8-1&keywords=combination+lock+RV
I prefer the black ones with white numbers over the chrome with black numbers.
I took me about 20 minutes to figure out the first one, then another 20 minutes for the other 5.
I got the covers for them as well to keep the road and dirt out of the tumblers. I've never looked back.
For the door... I'm still trying to decide if it's worth the 200.00 for a pushbutton solution or not.
Time will tell.