Hmmm...? So the 4 dr. only has an extra 130 lbs. of payload capacity. That's not much for the 3 extra passengers you can supposedly haul, or all the extra gear on the larger storage area. 1030 lbs. vs. 1160 lbs. of payload.
For the 2 door: The manual says anytime you have 430 lbs. of payload, you cannot exceed 43 mph.
For the 4 door: At 645 lbs. of payload, you cannot exceed 50 mph.
They say you should only use High gear for hard surfaces and with light loads. Two adults, a spare tire and carrier, some tools and gear....apparenty there is no such thing as a light load for these things.