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The wheel/tire can always add a level of shock absorbing.
I'd be more concerned about what happens when you flip the car at 30 mph (or 10 mph even).
(I'd suggest splitting up that giant paragraph into a few coherent pieces. I might have had ideas while reading it, but lost track of them in keeping track of where I was in that paragraph...)
Now the rain protection issue (ingress protection):The plastic enclosure on your receiver or even a piece of plexiglass over the electronics will offer some level of protection but if you truly want to operate in the rain i would go a step further. The integrity of any enclosure you build depends on your design and how well it is constructed (so its hard to give you an assessment on its effectiveness). Buying an enclosure might be a simpler option but be aware any modifications you make may impact the integrity of the enclosure. A little reading on Ingress Protection or NEMA ratings might give you some ideas on what level of protection is appropriate for your application.
FIRST: Slow the robot down to some reasonable speed. 30MHP is way to fast and there is no way on earth an Aruino based controller can provide any amount of autonomous control to a 30MPH model car.
If this is an RC model race car then faster is better and the control problem is solved because YOU are driving it. But if you are bulding a ROBOT and not an R/C car then the FIRST step is NOT how to mount a motor or vibrations but CONTROL ALGORITHMS.