Frame And Members problems of the 2001 Chrysler Town & Country

We purchased a 2002 Dodge rollx converted minivan and a 2001 Chrysler rollx converted minivan with an elk roof addition conversion from the rollx CO. In savage minn. About a year ago. When we recently began carrying more than one passenger we noticed and felt a bottoming out with little bounce. I got a look at the rear suspension and was supprised to find that they dropped the floor just above the e-brake line and leaf springs. The distance between the bottom of the floor and the leaf is one and one half inches. The distance between the rubber bumper and the axle is over three inches. The leaf spring and brake cable cannot take the damage for any length of time. We have to remove the spare and rear seats to drive somewhat safer. Contact with the company was futile.