I don't think they will fit. Some people have used 245/75/16 (30.47) and they just fit with modification to the rear fender wells.
Really, the rear is an issue? Typically, its the front area that's an issue for larger tires.
I don't yet (its on order) or I would do just that. No dealers near me have any new or used either. I guess I could detain the Amazon driver next time they're here. Or maybe you could measure?Do you have a Promaster? Go out and see how much clearance there is in front and behind the rear tires.
Thanks. Its interesting about the rear being the issue as typically its the front. I wonder if its just the plastic or is there body metal as well. Looking at this image, seems like metal is directly behind the plastic. Guess I stick with OEM size.😞Going with a 235/85 will even have greater issues with fit on the rear and maybe even the front (245/75's seem to have no front issues).