I'm not sure there is any difference. The XLT Luxury Package includes a power adjustable driver's seat (manual passenger's seat), heated front seats and a heated steering wheel.
If you live in a cold climate, these are well worth having.
The stock Mav (as opposed to the Tremor) has virtually no approach angle. The front is way too low to do anything other than a gravel road. But I believe you Mav comes with a front skid plate, so you'll get some protection.
Not sure if this is true. The main impact of towing on any truck is the tongue weight. Since the payload of the Tremor is rated way above any reasonable tongue weight, I don't see how it could be suspension related.
Because of the increased ramp angle of the Tremor, its radiator is smaller...
You need to distinguish between design affecting probability of a crack/chip and bad luck. Unfortunately, a sample size of two cracked windshields is way too small to draw any inference.