biggest tire with stock suspension

[johndeerezach]

so i have the b code rear springs and plan on putting the x codes on soon what is the biggest tire i can run on this truck. i can get spacers. 99 ext cab short box truck. thank you pics are welcome also.

 

[CrossTx]

What year truck? What size wheel?

 

[johndeerezach]

99.5 16" stock rims on have 285-75/16 on now want a little bigger tire if easily possible