I have 18" wheels on my motorhome. It seems this size tyre is hard to get!!

Is there any 7.50 X 18" truck tyres out there ??

The other option is to buy 18 1/2 rims and tyres ?? Or whatever is easily available ??

Its a Fuso 6 stud with duels on the back .. GVM is over 6 ton..

I assume popular  6 stud wheels from larger size fits ...

Yes I must measure stud distance..

Anyone been through this ?? 1986 Mitsubishi Fuso bus..