change/upgrade full door lock on pop-up?

[jeeplj8]

Is it possible to upgrade the door lock on the full door on my 2010 HW27S/C?

It has the drop down full door panel and a screen door style lock. the key looks like a blank, anything that size would open it, as if a firm tug would not. Curiously the half door has what looks like a real lock on it, but you cannot use the half door once the full door is in place.

Actually replacing the full door with an upper half that fits on top the bottom half would be better, less keys.

[The_Stuff]

could always add a dead bolt type lock to the door. might not look pretty but would work.