Specialist vehicles need specialist tyres. Look at who posted about the cost of tyres and the cars they own.
It’s like bike tyres, tell a normal person how much specialist bike tyres cost and they will tell you new tyres for their shopper bike cost a fraction of that amount.
Likewise last set of car tyres was £200 for all 4 fitted. Cannot possibly imagine any reason to spend upwards of a grand
Edit - or even how you might be able to do that. Most expensive car tyres I can find in my car's size are £76 each