[jagizzi]

I installed a 400W panel on the rear of our 2005 2720 using Z-brackets. I had to add additional aluminum spacers to allow clearance for the crown in the roof. The spacers were simply aluminum square extrusions.

The panel weighs 40#. I could still open and close the shell but elected to change out the torsion bars to the next larger size as they were fully adjusted to the max, and it was difficult to open. I am pretty sure that it would have gotten more difficult over time, hence the change out.

FWIW, and I differ from some on this, I firmly believe in backing up critical connections with a mechanical fastener. Failures happen, and I don't want my VHB tape attached panel to go sailing while I am traveling. The extrusions are through bolted to the roof with fender washers inside. The holes are sealed, at the roof, with 3M UV4000 and then the extrusions are also bedded in the stuff. There is no sealant in the screw hole itself nor inside at the ceiling. If there is a leak, and I don't expect it, I want to know it; and I will as it will drip on the bed ;-)

This setup has exceeded my expectations from a performance standpoint. I have gotten more than 30A into the batteries on many occasions and when the sun is available am always able to make up night time usage of my CPAP and the fridge.