Suspension Noise problems of the 2011 Chrysler Town & Country

Vehicle bottoms out and scrapes the bottom of the gas tank and its holding straps on any deep driveway approach. Occurrences have prevented vehicle use at church, doctor's offices, us post office, etc. "bottom hit" has occurred at high speed yet but a highway pothole could puncture the gas tank and lead to fire. The vehicle is a braun conversion van with an articulated ramp. The local distributor for braun, the ability center, contacted braun got the suggestion to change tire size along with an explanation that under clearance decreased in 2008 when Chrysler changed its body style. I contacted braun customer service and got no relief, no other suggestion. I worked with the ability center and we made a modification adding a shim to the suspension system elevating the undercarriage slightly. Braun mad it clear they would not pay for this work. Unfortunately the "fix" didn't completely solve the problem, clearly, there is a risk for anyone in the vehicle. The sound of the bottom of the car scraping sounds like a car crash, is very disconcerting and very distracting. Pulling out of church or the post office, both of which are on well traveled arterials, requires some acceleration to properly clear traffic. Right in the middle of such a move is when the bottom hits when you need your most concentration. Such an occurrence on today's highways in their national state of disrepair strongly suggests a car fire from a ruptured tank at speed. This needs a fix!.