Roof on my ToyHauler

I highly recommend vent covers. A buddy of mine parked his unit in a storage area and left one vent slightly open. High wind ripped it off and it rained in for two months. Totaled his unit.

I installed the cheaper vent covers... well worth it...

keeps vents open during hard rain and no fear of water entering.
parked or going down the road.

my trailer has 3 vents. all have the covers now.

I just pressure washed my roof... may need to over-coat it soon..
collecting information of types of products.

Both products work well. Dont make the mistake I made with mine. I thought I has EDPM and I had TPO. Same product used but prep is slightly different to help ensure adhesion.

the dicor self leveling lap sealant is good stuff too if you need to go around any vents, antennas etc. just clean off the old and apply new. I have a dicor roof.

Use Eternabond to seal any rips in your roof. Clean well before applying.
I restored my rubber roof last year coating it with Heng's Rubber Roof Coating. It's easy to apply and does not need a primer. Again, clean well before applying.
I would not replace the roof unless it was in very poor condition. Coating it makes more sense.

I think the vent covers are worth installing. I leave my vents open all summer and have never had a problem.