I'm specing my first truck and I'm wondering what slider length to go with. The company truck I've been driving for the last few years has a fixed 5th wheel and it works fine for the job I do now. I'm pulling tridem mechanical rgn and I'm quite used to loading it right weight wise, but I want to spec a truck that would have the capacity to pull a single jeep too. How much would I need to slide the 5th wheel forward (from center of the drive axles) in order to lift the jeep off the ground and onto the frame for when it's not needed? How much would I need to slide it back (from the center of the deives) to NOT take the mud flaps off turning with a jeep on the ground?