Considering this TV wallmount armature as a base for the solar panel roofmount. I'd add a skeletal cradle to it, which the folding panel would nestle in. Then craft the roof mount as previously described but with enough vertical room to encompass the armature. Idea being to release the roof mount then lift and orient the panel to the sun for maximum solar energy capture.
Just need to find out if the 15deg range of motion of the TV-mounting plate is fixed in relation to the swivels in the armature. If the 15deg tilt spins with the 360deg head, I'm in business. Or maybe I re-engineer it so the 360deg plate is at the base, on the roof deck instead. So the whole armature spins, then the axis of the 15deg tilt doesn't matter as much. I'd want to be able to park the vehicle in any orientation and be able to aim the panel right at the sun.
https://www.monoprice.com/product?c_id=109&cp_id=10828&cs_id=1082821&p_id=16128&seq=1&format=2
https://images.monoprice.com/productlargeimages/161281.jpg
The following diagram seems to indicate the +/-15deg tilt is fixed in relation to the last pivot ('wrist'?). If the 360deg swivel plate is moved to the base of the mount, the whole mechanism could be oriented in any direction and the +/-15deg becomes a left-right tracking swivel, beyond what the 360deg plate would provide. The planet rotates 15deg/hour. The panel could be erected, the armature locked down, with the 15deg cocked to maximum eastward rotation and left loose, so the panel could be easily swung from the ground. Or even arrange it so max eastward is another 15deg / hour ahead of the sun, which is still pretty close to perpendicular to the sun. And then you get 4 hours of near-optimum sweep, before you have to get up there and swivel the whole structure.
Look at that image, cock your head to the right, the base at left is 'down' and move the 360deg plate to that end. With that setup, the panel could be aimed anywhere at all.
Too, there are telescope tracking motors which correct for Earth's rotation. Put such a thing on the base and all you'd have to do is set your plate perpendicular to the sun and kick on the power to the tracking motor. And then you don't have to do much of anything while maximizing your solar power harvest.
The mount is $18.
eta
The distance from shoulder to wrist pivots is 12.4". My folding panel is about 22"x44". So the panel in a horizontal orientation could readily reach the near-vertical. The roof mount structure would interfere with a vertical arrangement, but that doesn't matter much as even in winter in SoCal's rough latitude only need a maximal tilt of 55deg. (LAT*0.89)+24=winter panel angle
eta2
The collapsed height of the armature is roughly 2-1/2". A little creativity in the cradle arrangement would let some of that height fit up into the backside of the panel's aluminum channel frame. So the locking / flat roof mount could wind up being about 3" tall overall.
The height increase would also solve the issue of using the hood locks. Their base pin could be bolted to an intermediate flange in the roof mount framework, if that framework is like an 'E' in cross-section.