Denver9 wrote:
....... they came up with HT215-85R16 .........
Sorry, but there is no such thing! I suspect they misread things and the letters are "LT".
Denver9 wrote:
....... The supplier had sent the wrong size. he sent LT215-85R16 instead of the HT series......
Nope, the supplier correctly identified the mistake being made at the shop end and corrected it.
Denver9 wrote:
....... I brought it to the attention of the mechanic and he agreed there had been a mistake......
I'm going to truncate the rest of your post, but I'll answer the questions posed.
I'm not sure why your tire shop said there was a mistake - but perhaps they are taking the approach that the customer is always right and should not be contradicted - even if the customer is wrong.
No, the LT's were the correct size for that type of vehicle.
And, No!, there isn't a list of tire sizes by RV make and model. Normally, the base vehicle is what should be used to determine the proper tire size.
But there ought to be a sticker on the vehicle - called the vehicle tire placard - that will list the originally tire size and the proper inflation pressure for that size. It is usually on the driver's door frame, but sometimes these things are found in the glovebox, on the fuel filler door, or in the case of an RV, on the side door. It is a goverment requirement and if the RV converter makes a change, he has to redo the vehicle tire placard accordingly.
So I think the supplier was correct in what was supplied, so be prepared for that.