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Not to sure about putting new material over old. In construction 35+ years. Never ever excited about putting new roof material over old as one never knows what is hiding underneath? My 2009 has spent first 12 years in garage when not being used. Now in So. Utah rig is in open covered storage when not out. Temps as you know can be more than 110 in direct sun in the summer.
I inspect roof often and clean, wash and use Dicor protectant. When roof is cleaned it looks almost good as new.( A lot better than many newer rigs I see with white roofs)
Come the time for replacement I would probably go with tear off and replace so anything underneath can be inspected and repaired if required.
Best of luck with your 5er, safe travels
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09 2955rl,5 Sailun 637 , Mor ryde wet bolt kit, 50 amp progressive hard wired surge protector, solar , 4-6 volt Interstate batteries, charge indicator, HD tow hitch ,2-2000w Honda generators, Back up camera,2015 F-350,6.7,
air bags,, 50 gallon Titan Pace Edwards bed cover, TST 507-FT
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