I think you will find the 7.5 motor limit is for 2wd only, and I guess with a 5.5 motor you would be running 4wd? In any case for any motor 7.5 or quicker in 2wd or almost any motor in 4wd I would say you would need the RS Pro as we do not run blinky or stock spec in 1/10th off road.
I've seen people running RS Pros in 4wd and needing 2 caps on the esc and some even a fan, so I guess from that a RS would not last that long before thermalling.
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