So after a few phone calls and emails, I discovered that Jayco used ProRac's Permanent Mount Rack System.
http://prorac.com/permmounttent.php
This model comes in different widths, to match the width of your camper.
http://pdf.racksforall.com/prorac/prorac_tent_trailer_fit_list.pdf
I only have one last question. There are two mounting methods for this Rack System:
1.) 7/8" Long wood screws, down from the top, into (but not through) the rim wood of the roof.
2.) 1-3/4" Long Truss head bolts, up from the ceiling, through the rim wood, into lockwashers on the roof.
I imagine that the first method would be the simplest and less likely to eventually leak. But that method #2 would have the higher strength. Would you guys agree that I should pursue installation method #2 for hauling a family's worth of bikes?
