Find out the weight of one panel. Add up the total weight. The panels that hang are also roof weight. So 30X8=240 sq-ft. At 1300# that`s 5.4lbs/sq-ft.
1300# is say 6 X 200# guys. Spread out over the roof it's probably ok. However if you wanna get picky you are gonna point mount the panels for airflow. say 6 each 4X4 pads per panel. That's16 sq inches per footing. Each pad will hold 8.3 pounds of a 50 pound panel. That's 6psi.
The side mounted panels are dead weight but it is over the walls so you don't have span weight across the roof with those.
That's all the compression load on the interior walls. The walls are thin but I don't think they will directly buckle.
Someone said something about CG. Lets say the roof is 10 feet above the axles. 10 feet times 1300# is 13,000 foot pounds.
For reference let's guess the Coach carries 70% of it's 12,000 pounds below the floor. The floor is 2 feet above the axles so it's 8 foot to the roof from there.
12,000 X .3 = 3600 X 8(feet) = So the natural momentum is 28,000 foot pounds. You are adding 50% more lateral momentum loads to the vertical center of gravity.
I have no idea if the suspension of the standard coach has 50% lean margins.
Another concern to me is lateral loads. There is really no diagonal bracing inside this thin square box.
Let's say you pull 2g in a turn. Attach a winch and load cell to the roofline edge and apply 2600 pounds. If you don't pull the wall over I am guessing you will be getting close...
This is all educated guessing on weights. but the math is close and gives you an idea of the magnitude of what you are planning.
It is also how you should be thinking about this from an engineering standpoint.
You haven't talked batteries but I assume they are gonna go inside? at floor level? The good news is you have a giant frame to tie into. The bad news is you should have a look at RV payload and make sure the combned weight of solar panels, solar gear and chargers plus batteries stays under MGWR of the coach.
