Up until now, the only Wranglers I've owned have been the lighter 2-doors. This time I think that I'm as heavy as possible: 4-doors, diesel, steel bumpers, heavy ACE rock rails, oversize tires. The braking really feels like it's struggling against the heft. Has anyone else noticed? Does Jeep differentiate in its brakes in a product line that varies in weight by at least 1,000 pounds: between a 2-door Sport and a 4-door diesel? Do they all have the same brakes?