Noted, thanks. Wing nuts already on the spare tire carriage bolts as well but need to find some of those plastic insert lock wingnuts - you can spend hours poking around the fittings & hardware section at the lumber yard and end up spending pocket change
Three bolts on the front rail for sure since that is where I would think the most wind pressure will impact, although the slipstream and angle in front should minimize that.
I got the wiring holes drilled on the frame and the first two pieces of 1/2 inch OSB screwed down. Need to figure out how to extend the front out to make some extra room up front & incorporate the front storage box into the "system". Will work on that tomorrow in between coats of 'the mix'.
Was almost tropical today with a high of 57 F - tomorrow a predicted high of 47 F and 100% chance of rain

Should be some fresh snow in the mountains Sunday morning !