My handle was loose when I received the trailer, 2807C, and when I dug deeper I realized that the top screws were only into the fiberglass. After several attempts at trying to fill the holes and using different anchors, I installed a 32" long piece of 3/4" X 3" oak next to the window from the seal trim to the ceiling and then use 2" stainless steel screws to hold the handle to the oak trim. I thought this would give better holding power versus a anchor and looked better than a bolt. The oak piece almost looks like it belongs there.

I should have proofread that first. The oak trim is on the inside of the camper next to the door opening, causing a sandwich effect when the screws are tightened.