I'm not worried about the rails being able to hold the weight. I'll have about 250lbs up there with the tent and tack. Once we are set up I'll be looking at about 600 lbs on the roof. I've thought about using 2x2 angle down the entire bed sides to distribute the weight more. If I run the supports down to the bed it will interfere with my storage plans.
As for the rake, I'll just have to monitor the front coils while they break in more. I think once I have the tent mounted, steel rear bumper, 35" spare and spare fuel water it will sit more level. I do like how the front suspension keeps the geometry close to stock. Less wear and tear on the ball joints and cv's.