Had the same issue opening and closing the back lid my fingers would pull it off as there is no handle.
I started by mounting a Ram mount 1inch ball so that as I lift the lid I had something to hang on to rather than touching the latches and using them to pull on it seamed to be the smart thing over time the hinges are not designed for that. The Ball mount is multi-purpose.
I use a small amount of Sashco 13010 10.5oz Sashco Sealants Clear Lexel Adhesive Caulk link below has not failed in 3 months of winter.
I also added had an issue with water ice and mud in the gaps of the back and side lids in addition to the gap between the camper and the bed rail, easy fix for this was the addition of Trim-Lok the link below trimmed out all these areas that are now fully sealed. Trim-Lok Trim Seal with Top Bulb – Fits 1/8” Edge, 7/16” Bulb Seal Diameter, 25’
Hope this helps you with your modifications.
Tom
