Originally Posted by Jboles
Here is how I made a similar rack. Cross bars are from VanTech out of Brooklyn, NY. They do work van utility racks for the most part.
I bought some steel angle from the local steel supply store, drilled holes and bolted them to the slotted cross bars with carriage bolts. The wood deck is then bolted to the flat part of the angles.
It's big and bulky looking but gets the job done. I went with the aluminum cross bars to reduce weight but with the steel cross bars and wood deck it's quite a beast.
I have a similar top but never see me adding anything above the existing converter-installed fiberglass roof. My particular roof has the upper roll cage added along with the factory c-pillar being removed for extended height rear doors.
For the "easiest" installation I'd go with JBoles arrangement---it wouldn't require drilling or cutting into the fiberglass roof. That particular attachment scheme and location of the deck is superb for added mounting area of solar panels IMHO anyway.
Could those flexible and conformable solar panels work for this project? OTOH antennas could be mounted directly to the fiberglass IF there was sufficient under support to help spread the weight across a larger footprint.
I'll look forward to seeing how this progresses.