Picked up this 1983 K5 with 9.300 original miles. The truck is pristine and would like to keep it that way with the exception of tires. Does anyone know what sizes (larger than 15") can be installed without modifying the suspension or cutting?

 

I'm running 285/75r16 with no cutting, trimming, or rubbing.

 

Wow, that thing is amazingly clean! I see why you would want to upgrade the tires. Those are a bit puny.