I had to replace my trim around the door a few years ago, when Sunline was still in business.
I don't know what year your camper is, but mine is a 2002.
Sometime after 2002, Sunline started putting SS Screws in (through),the vinyl trim at various locations, to keep it from popping out. That's what I was told by the factory. That's what happened to mine, it popped out while I was traveling down I 95.
If yours didn't have the SS screws to hold it in place you might consider them. Just thought I'd pass that along.
2002 Sunline model T-2975 (large Bath)