I installed a large bubble level I can see from my rear view mirror on the front cap. It required drilling two mounting holes.
IIRC there was a thin gel/fiberglass layer over an AL2 sheet that I drilled thru and that is how the front cap is constructed.
To prevent water seepage, I squirted butyl rubber caulking in/around the drill holes before aligning the level and screwing it in place.
2012 Fun Finder XT 276 Toy Hauler & Harley Davidson Ultra Classic with Condor wheel chock
2014 Dodge Ram 2500 AT 4X4 Crew Cab 6.4 L Hemi, 373 gears, tow package, Rambox option, Revolver X2 tonneau cover, Equal-I-zer anti-sway hitch.