That is not bad really, much worse than 16" tires I am sure.
But I just bought 6 used 9R22.5 tires for my truck, the new replacement cost would have been $1,900 installed. Ouch!

Post a wanted add for the 18" wheels if you want some. I can't say for sure what they would cost, as I don't have any for sale, but I would guess between $25 and $50 per wheel would be reasonable, depending on a number of factors.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-