I have only installed the dressers on my 10. Be careful of the opinions you get here, as dresser sells several retread versions. THe Monster is a larger tire, but not available in 15-6X6. They only offer the premium, which is not as big as the Monster. I assume it is still larger than stock or the dresser Std retread, which I assume is similar to stock.
You have a bigger clearance then me and I speculate that you would need only minor work with a round file to make them fit, assuming you accept a smaller clearance. I don't think I have more than 5/8" at any point, with much of it 1/2". I tend to go a bit larger in the areas that bulge more from weight or grow in size as the tire losses air. You could also go with the Std retread, though it won't last as long as the premium.
They wear well. I have 225 hours and just flipped them for the first time. Expect I should go well past 500 hours on them.
Larry