I was just curious. My last vehicle, a Subaru Forester I mounted the solar panels (3 15w) on the hood and it rode fine. However I did fab up some reinforcement aluminum to strengthen under the hood and installed hydraulics similar to the rear hatch. Typically in a collision do the rotopax take off?
Solar panels, would be a different matter. In there nature solar panels are flimsy and prone to breaking if handled incorrectly or receive a sudden shock thus in the event of an accident
shouldn't cause to much injury where as a so many gallon fuel tank/carrier will have a significantly greater mass and thus inertia in the event of an accident, this combined with the contents would cause significant injury to anyone nearby.
Now i wouldn't advice it for use on trails as well as public roads because in the event of a frontal impact and they didn't become separated from the vehicle, then you have the potential for a damaged tank to leak onto a potential still running hot engine. Here you have a explosive device. If you couple that with such an event that you become trapped in the vehicle, a non fatal incident could easily become a fatality.
The strength of the bonnet im not questioning, they are stronger than many people give them credit for, although yes it would need strengthening.
Now my experience isnt with Rotopax they are not that common over here in the UK, although i have dealt with several incident involving farm machinery, in particularly quads, and side by sides and on the few occasions i have attended where a quad has flipped carrying Jerry's on the front rack and the can has stayed where it is but has manage to break (i think it may have been the seal) and has begun to leak. i have also dealt with similar incident where the can has parted with the vehicle and become airborne landing 10-15 ft away.
So professionally i wouldn't advice you mount anything upfront, Just my two pennies worth.
MadMedic