Dragging towing hitch - air lift bags

Hi,
I'm new to this forum, but have owned a 2012 Quest for 3 years. Recently, we added a class III Curt hitch, not for towing, but for attachment of our bike rack (overkill probably). Unfortunately, now if the van has several passengers, the hitch will drag when starting up any kind of an incline or if going over a big heave in the road. I've been looking into air bag lift kits for the rear coil spring suspension to alleviate this when carrying full loads. Unfortunately, there does not seem to be much out there. Firestone has the Coil-Rite Rear Suspension Kit. Have any had experience with this or other kits? I'm at my wits end as this dragging really destroys the utility of the van.
Thanks for any help,
John
I'm new to this forum, but have owned a 2012 Quest for 3 years. Recently, we added a class III Curt hitch, not for towing, but for attachment of our bike rack (overkill probably). Unfortunately, now if the van has several passengers, the hitch will drag when starting up any kind of an incline or if going over a big heave in the road. I've been looking into air bag lift kits for the rear coil spring suspension to alleviate this when carrying full loads. Unfortunately, there does not seem to be much out there. Firestone has the Coil-Rite Rear Suspension Kit. Have any had experience with this or other kits? I'm at my wits end as this dragging really destroys the utility of the van.
Thanks for any help,
John
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