Hi Brian – I talked about racks with more than a few people at expo - the differences between the construction of the J30 and J180 (Habitat) are subtle but significant. Mounting racks on the J30 is straightforward. There is access to the underside of the cap, so fasteners can be easily reached when popped up. Gear weight is offset by the struts, which can be upsized if needed for regular loads.
To put a rack on the J180 top is more challenging. The top is formed of an inner liner and outer shell separated by coring. If racks are fitted, one must ensure the mounts do not crush the coring or pull through into an open space when tightened. A backing plate would be needed, but it and the ends of the fasteners will then stick up into the smooth area where the mattress lies. As you mentioned, any gear would have to be removed before opening. I caution against adding weight to the cap due to the balance in the torsion spring being sensitive to load added at a distance from the pivot (ie, toward the outer edge of the cap – the rear when closed.) Two Yakima bars and towers are 14 lbs or so, it probably wouldn’t fail the torsion bar. But keeping all this in mind, I recommend just using foam pads & straps to carry a boat on the J180 since you have to take it off every time anyway – why invest in the racks/bars/saddles?
Dan – Aside from weight, since the J180 (Habitat) top is facing down when deployed, any rigid mounted panels force a set up vs. charge up decision. Even on a J30, I’d go with folding or flexible panels, so you can have camp set up when you want and where you want. Orient the camper toward prevailing wind, the best scenery or in shade, while the solar panels are off the truck and placed to optimal sun exposure.
Wade – Not practical or cost effective unfortunately…
cheers, John



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