Trailer tires vs regular tires

It's my understanding that one must make sure the rim is also rated for 65 psi also, before using a D rated tire.

Unfortunately the aluminum rims that came with my TT are rated for 60psi max.

PartyMarty wrote:
As has been said : As a general rule P or passenger car tires are not a good substitute.
The load rating (in pounds ) posted on the sidewall of "P " tires must be derated by 9 % .
What sometimes happens is somebody has a " take off " tire from their pickup that has P rated tires and they mount them on their RV because their RV tires are "cracked " from the sun and ozone .
Then the P tires fail because they do not have adequate load reserve capacity , either .
As others have said an ST or LT tire with additional weight capacity in pounds is the cheapest way to prevent tire failure .
Presuming that you have load range "C" tires max 50 psi, now :
If you buy a load range D tire you can pick up 10- 20 % in load rating in the same size tire . If you inflate to 65 psi as shown on the sidewall you pick up reserve capacity .
Further , even if you miss an inflation check and your tires deflate from 65 psi to 50 psi you still have the same load rating as the C tire at 50 psi.