Looking for a hitch receiver type carrier suitable for single or double carry that has another receiver on back. Looking to trailer a 20 foot RV with the DRZ in the middle. Has anyone run across something like this? Currently have both single and double carriers from Discount Ramps and am very happy with them but don't see this configuration on their website. Tow vehicle is Ford Excursion with air bags so tongue weight should not be an issue.