235s are fine on a 7 or 8 inch. On my station wagons (have 3) I run 235/75/15s on a 7" rim , 235/70/15s on a 8" rim, and 235/55/17s on a 8.5" rim and they all work well.
295s would be a min of 8 for sure but prob want wider...
295s would be a min of 8 for sure but prob want wider...