Body bolt kit? Like as in the cab? I would not use stainless. Stainless does not have the strength in my opinion. How about some grade 5 or even grade 8 hardware?
Just my thinking, the stronger the better.
~ Phillip 1949 GMC Suburban - 10 year project 1952 Pontiac Chieftain Convertible straight 8 hydramatic 1945 GMC half ton truck - Driver- Sold 9-15-25 1946 Chevy COE - SOLD 1-5-26 BUH BYE CHEVY! 1959 GMC Half ton long bed NAPCO