Just wanted to give you a data point just in case you are interested...
I have no experience with RV Armor Roof material. At those prices, I'll just assume it is a great product (...it better be!).
I assume you are talking about an EPDM or TPO roof...
Keeping water OUT should be of utmost importance to RV/TT owners.
I have had multiple RVs and on each one I have resealed the roof and vents and joints with Dicor Roof Sealer and have been 100% satisfied. It comes in a 1 gallon can. Costs $80-90 per gallon. My 30' RVs only seem to use 2 gallons and that was 3-4 coats on all the vents/joints/edges and 2 coats on the rest of the roof surface. It has the consistency of about 2-3 times as thick as regular wall paint. I have been thrilled with the results, have never had a leak, and it only cost me (DIY) less than $200 per RV. It only takes a few hours to do. If you can paint a bedroom in your house, and you are comfortable getting on the roof of your RV, you can easily do this job. Even if you hired a handyman, I bet you could get it done for less than $1000.
Here is a link with before/after photos:
https://www.rv.net/forum/index.cfm/fuseaction/thread/tid/30201452.cfm
I check my roof a few times per year. So far, all looks perfect. It is possible that I might need to redo the job at some point in the future...perhaps it isn't as permanent as RV Armor...but if I do it will only cost me another ~$200 per RV. I suspect it will last at least 5 years but we'll see.
Good luck!
Chris
San Jose, CA
Own two 2015 Thor Majestic 28a Class C RVs