If I had to replace a membrane for any reason I would NEVER spend more $$ on any membrane. I had a failed membrane in late 2015 and in January 2016 I installed
This. It was essentially the same price as a new rubber roof and 15 months later I definitely made the right decision. Night before last we had a major thunderstorm and lots of limbs were falling all around the campground. Two campers reported rubber roof damage due to falling limbs. I was hit a couple of times and no damage here.
I have said before, if I bought a brand new RV today, I would have the roof sprayed tomorrow before I ever moved in. IMHO any rubber roof is going to leak. The question is when and will it be visible or destroy your rig before you notice it? My rubber roof membrane failed and was leaking through the membrane after 5 years in service. Not a caulking issue - failed membrane.
Off of soap box. It is going to be a great day at the campground.