Our 2950RL has a 35 inch wheel base. The 2970RL is essentially the same coach. I did install the MORryde wet bolt shackle kit and CRE3000 on our 2950. It made a big difference in towing IMHO. I had plenty of tire to coach clearance. I went through all of the MORryde qualification guide for the CRE3000 and our 2950 measured up. It has 4400 axles.

Axle spacing, tire to coach clearance and the equalizer hanger dimensions are the main thing with the CRE3000. The wet bolt and HD shackle kit doesn't care as long as you get the right length of shackles.