I can certainly sympathize with your door lock issues; ours was broken when we bought it.
I want to give a little bit of warning though - those house deadbolts aren't made for the beating that towing a trailer (especially one with older axles) can dish out. Our PO made that same mod, and during our second camping season it failed while we were on the freeway. I just HAPPENED to be looking in the rear view mirror & saw the door fly open & bang against the side of the trailer!
Instant 'sprung' door - when we closed it there was a nice air gap between the top & bottom of the door & frame.
We thought we had forgotten to lock the deadbolt, so we locked it and got back on the road. Half an hour later, a car pulled up along side us and a lady yelled that our trailer door was open. The simple act of towing the trailer created enough vibration to slowly work the bolt out of the door.
We pulled off the freeway - conveniently right near a Home Depot - and got a piece of wood to jam through the handle next to the door to keep the door closed. (It spans across the edge of the door frame and holds the door shut.) Somewhere here on the Forums are a couple of threads with very clever hand made versions that look like they work much better than our quick fix.
Needless to say, we ended up saving our money to buy the aftermarket lock replacement kit from Inland RV. A new door would be much more expensive, and just about impossible to find. We used the block of wood for a couple of months in the meantime, locking the deadbolt before each trip. By the time we would arrive at our destination, it would be unlocked again.
Oh, we were able to bend our door back enough that it closes pretty well, but it'll never be the same.
Despite all that, there's no place I'd rather be than camping in my Argosy.
I hope you have lots of fun trips in yours this year!!!