Tire Size for a 2000 24' Sierra Lite

[destreet]

Hi everyone,

Looking to purchase a 2000 Sierra Lite from a person in Wyoming. She has no cell service and it is hard to reach her. She told me 2 of her tires need new valves, so I am planning on bringing a couple of tires and wheels with me. I know the lug measurements but she did not tell me the tire size. Does any know what the size might be. Camping world told me the tire size might be ST 235/80R-16. I thought that might be a beefier tire that what is on them..Thanks for the input. I hope to bring it back on Sunday!