Shouldn't have to chop the fenders or add any bump stop if you're running a 37x12.50 or even 37x13.50 with appropriate offset. If you stick to more than 4.5" backspacing it should be ok.Here's 38x13.50's with chopped fenders and the Dynatrac Endurosport. At least for now. It's getting replaced by the 3.5" Metalcloak Gamechanger as soon as the rest of the parts arrive.
It could flex more, but the rear tire was hitting the pinch seam. I'm trimming them back on my next day off.
You'll probably have to chop your fenders, to avoid adding more bump stop than what comes with the endurosport. Or leave the fenders and add more bump stop, but lose some travel.
[Banned Site] ran 37x13.50x17 with 4.75" BS with zero rubbing after he adjusted his rear fender liners with a heat gun. I'll have pics of basically his same setup later this week.