I don't foresee this as an issue for a couple of reasons: a, the canopy I chose,
link, has a minimal dome. b, the edge will be well under the penthouse top of our SportsMobile and a couple of inches inward of the side doors and rain gutter. c, I plan on having the canopy slant forward enough to minimalize the dome effect enough so minimal rain shed runs towards the doors/drip rail and will be adjustable for such conditions. d, don't plan on using it during heavy rain nor storms. e, the slight dome allows me to easily open the side doors with out rubbing the top.
I can only give this a try and adapt from there.