Take control of your situation.
Don't buy what the idiot dealer forces you to buy.
Order tires online from any of a zillion places (Amazon, OnlineTires, Tire Rack, Discount Tire, etc) who will drop ship them to you ANYWHERE in the country and bring them to ANY tire shop to have them installed.
...and don't tell me you can't do this because you are on the road. I've had tires shipped to my site at a KOA overnight from Amazon and had them installed the next morning.
This isn't rocket science.
If you choose to get ripped off then don't be surprised when your tires explode again.
Do a little research and stop relying on some dealer (whose ultimate goal is to get your money) to tell you what to buy.
Sheesh!