I've never heard of QRE before but I have used Eternabond. My thought is that Eternabond is tested and proved over many years and many miles by many RVers. I'd rather not be the "test dummy" for a product that might have the same track record.
Can you order Eternabond online?
Good luck whatever you use.
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2013 Jay Flight 26 RLS
2014 Ford F250 Super Duty
Reese HP Dual Cam