To my eye, the Jsport Chase still has a slight rake to it, which is fine with me. I don't tow much at all, nor would I hardly ever be maxing out the payload, so "load squatting" would be of little concern. What most appeals to me about the Jsport trucks is the 1.5" front lift which gives the RL significantly more ground clearance where it most needs it. The rear diff already has over 9" of ground clearance unladen, but the front cross-bracing under the engine squeeks by with just 7.9" of GC. OTOH, the rear wheel control arms are quite low at about 7.25" of GC near the wheels, but mounting 1" taller tires (e.g., the Jsport package) would add a half-inch of clearance to those nick points. But dealers appear positioned to seriously gouge the buyer for a Jsport-ed truck, so I would be in favor of having the leveling kit only installed, then upsizing the tires when replacing the factory Firestones.
I agree that the reason for the low front end on the RL (and Pilot) is aerodynamics and fuel efficiency, and the rake is to lessen the squatting under load. Kinda funny how more than one Honda spokesperson mentioned that Honda raked the RL because their focus groups commented that higher rear ends gave the appearance that a truck could handle bigger loads! BTW, the Tacoma TRD Off-Road edition omits the front air dam to improve the angle of approach by a few degrees. AFAIK, the EPA mileage ratings are unchanged from other V6 4X4 AT versions of the Taco.