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Welcome to the forum!
Dicor makes a product specifically for your roof. We don't use any Hengs roof products so I can't comment on that brand but I have used Dicor with excellent results.
Depending on how long your trailer is, 1 gallon probably isn't enough.
10 years can be a long time if no previous maintenance was done. Using a coating isn't going to hurt anything but your pocketbook so I say if it's going to give you peace of mind, do it.
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2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
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