hi group. my son has an 2005 santa fe. it has a factory hitch and trailer wiring. i'm disabled so we use a hitch mounted platform to haul my powered chair around. the problem is at 125 lbs total weight the back of the santa fe sags down and raises the front enough to shine the head lights way to high. the dealer has no recommendations or a way to boost the rear suspension when under a load. has anyone here had/resolved this suspension problem? barry