We hit a big milestone when we got the trailer moved out of the garage and bolted down to the frame. We lifted it pretty comfortably with four people, so current estimated weight is about 300-400 lbs. It took most of the day to get it aligned, mark bolt holes, lift the trailer off of the frame and moved the frame over, drill the holes, lower the trailer back onto the frame and get it realigned, and finally install the bolts. The trailer is held in place with 7 1/2" by 4" stainless screws, with nylocks and some threadlock just in case. First install in the open air is the solar panel, a 120W Kyocera module. It had been previously installed, but I removed it to keep the trailer as light as possible until it was on the frame. There are four L-aluminum brackets, one for each corner, made by bending rectangular 1/4" stock in a hydraulic brake. The frame of the panel is mounted to each of these with two 10-24 stainless machine screws with nylocks. To mount the brackets to the trailer, I drilled out a hole for each one into a structural member under the plywood. I then epoxied in a fiberglass tube and tapped it for a 1/4" bolt and used it to bolt the bracket on. It turned out very solid; you can shake the trailer by that panel without any worry.
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