I need new tires for a '99 Toro Proline 36" geer/fixed. It uses 13 x 6.50 - 6 on the rear. What I see in the catalogs (ex: J. Thomas; Cedar Rapids) are the 4-ply versions. These are rated to 28 psi, as opposed to the 2-ply 14 psi. The tires are supposed to be inflated to ~14 psi. Can I inflate the 4-ply to just 14 psi without any issues (sidewall wear; bead coming off rim; etc)?