That definitely sounds like an option. I'm not familiar with the durability of the roll on stuff vs LineX. Any ideas?? It also has to be idiot proof.
If it's being done by a shop or at home the most important thing is the prep work. Sanding the paint/fiberglass and wiping it down with the correct surface cleaner is the real key to get long term adhesion.
Follow the directions on the website to the letter.
I did the roof four years ago and no lifting,chalking, or any other blemishes. Camper is outside always and sees temps from 115-20 deg F and marine layer salty fog.
Buddy in the valley now has it and I check the roof every time we camp together