I have a 1980 GMC K15 short box that I am looking at installing the shakle flip kit getting rid of my lift blocks. My exhaust system goes under the middle of the rear stock shackles on both sides and has about 1.0" clearance. Will this be a problem when I install the shakle flip? Also I tow a 26 foot 5000 lb. travel trailer and I am kinda concerned if the shackle flip will have a problem with the weight? I use a equlizer hitch set up. I have no towing problems with the blocks but I would love to get rid of them. I have seen other posts about towing with the shackle flip but no one has inquired about this much weight. Thanks for your time.