If I read your post correctly, you are going to loose 4in clearance between the front and rear tires. Is the distance between your axels enough to accommodate this loss in clearance?
Missed an opportunity to visit Thunder Bay year before last. Still on my list of places to visit. Welcome to the forum. Perhaps someone else will be able to answer your question more directly than me.
Steve & Diane
2015 Montana 3402RL
2017 F350 Super Duty Lariat 6.7 Powerstroke, Super Cab, Long Box, 4WD DRW
18K PullRite Super 5th ISR