This is the one on the Daybreaks...
Trimark
I had to replace the lock because the dealer lost all the originals. I may still have the plans for it. I will look. There is an adjustment of the dead bolt that may cause sticking, but not likely. I would check the door seal, you may have lost the foam seal and be sticking on the adhesive.
Unfortunately, there are not many reasons for an RV door to stick. Look for the low hanging fruit first, the rest are expensive, such as water intrusion into the door causing it to warp, or the wall changing the shape of the opening.
Good luck,
Bill