Question:
I recently bought two Cooper Roadmaster 14 ply tires and put them on my 32-foot Georgie Boy motorhome (front tires). I ran the prescribed 85 pounds of air pressure and they rode like a rock. I spent over $100 trying to get the bounce out of them, to no avail. Over 55 mph, they bounce up and down.

I then bought four new 12 plies for the back. Question is: Can I swap the 15 ply front tires for the two 12 plies on the back? And get a better ride and handling?  Thanks for your comments. I will be waiting on your answer.

--Jack in Dora, Alabama

Answer:
Hello Jack,

Thank you for the great question. We recommend weighing the coach to determine the correct tire for the load and also to determine the correct tire pressure.  The tire manufacturers publish tire inflation tables to show you the recommended pressure based on your load. It should be as close to normal to the maximum load you will carry. If you are not sure, add an extra 5 to 10 PSI for a safety margin.
  If the tires are not working well on front and are out of round, I would recommend taking them back to the dealer and getting another set of tires for the front. Chances are they will not work well on rear. You will not be able to rotate to the front later on without having problems again. On another note, make sure the tires are properly mounted and beads are correctly seated. Bottom line: I would not be in favor of mixing different tires on the rear, especially if they had problems on the front and I had a chance to return them.

Best wishes,
Robert Henderson

Do you have a question related to alignment, steering, handling, braking, fuel economy, tires, safety and maintenance of your RV? Robert Henderson, the president of Henderson’s Line-Up Brake and RV and SuperSteer/SuperStop products in Grants Pass, Oregon, is available to answer questions from readers. You may send your questions by e-mail to editor@rvlife.com.