I continue to be amazed by the myth that all LT tires ride rough. :h If you buy the right tires and properly air them up the ride is smooth and quiet while providing superior (vs P's), performance.
One of the keys in selecting the right tire is get a street tread. I recommend the Michelin LTX M/S 2's. I put them on my truck and the improvement in ride and handling was awesome. I just got a set installed on our C (thanks to the recall of the old M/S's) and they are so much smoother two or three of the persistent rattles that plague most C's disappeared. If you are towing anything, get rid of the P's as that is not what they were designed to do.
As Always.... Opinions and YMMV. :C