Truck being level doesn't matter. I did my truck a while back. I spent quite a bit of time on the doors. They were always hard to latch since I owned it. (15 yrs)
I think they are better now than they were new. Don't even have to slam them now. Just a light click. The striker post were wore half through from being mid aligned for so long so I replaced them from the help section on one of those card racks at A zone.
I am not happy with the replacements and am going to try and find some good originals that are correct for a longer lasting repair. I'm thinking of checking passenger sides at the salvage
yard. I also took the latches out and threw them in the parts washer to get the dirt out of them.
I lined up the doors with the weatherstrip removed to make it easier.
Once the doors were working good it was all down hill from there with the fenders core support and grill.
They had no quirks and lined up easy.