Bigger tires on a stock dually

[Zaairman]

Tried searching but couldn't find any results... Inlaws are wanting to upgrade the tires on their stock 2004 4x4 dually. Currently has 235/85/16s. He'd like to go bigger if possible. He does not want to run spacers and the truck is used for towing (only verrrrrrrrrrrry occasionally now) an aluminum 4 horse gooseneck. I've heard that 255/85s fit but can't find any tires in that size, other than BFG mud terrains. Some have said that 265/75s fit, while other say they rub in the rear. Thoughts?

 

[TrailerHauler]

255's without spacers is the rule of thumb I've always went by. Any bigger and I guess they can rub when the bottoms bulge out, with a load on them.

 

[NEVRNF]

Here you go Toyo M55