my motortrike exhaust was only pulled down 1/2 inch. not sure why you and rams was pulled down that far. the clearance between the exhaust and the rear was probably 1/4 inch.
Whenever you start adding more air to the air bags the closer the exhaust gets to the rear axle. Mine had been broke on the left side and I guess other owner had it welded. The right side just broke. Rams was broke on both sides. I got it fixed now now and well pleased with the outcome. It might not have been a 1 1/2 maybe a inch. But still a lot of bind on the exhaust. If they did a so so job on welding the pipes on the collector at the manufacturer is where it is breaking at. Now I'm not worried about it.
David