tire size

Forgive me for asking the same ol' boring stuff, but after using the search bar and a ton of googling, I'm left confused, as I'm not really mechanically savvy. I got myself and archaic 2001 XL7, auto, which I use as a daily driver but want to set it up for the occasional off road/camping...

Hey team, Recently purchased a 2001 XL7 of a used car dealership in Melbourne, with 235.000kms on the clock, to use as a daily driver and the occasional off-road camping trip, once a month or two. Upon doing the pre-purchase routine inspection by myself, I didn't notice any suspucious signs...