Any 2WD full sized SUV or van should work pretty easily. If not "approved" by the OEM, U-joints are easy to remove.
Edit: I totally misread that. I thought you wanted the vehicle being towed to have a 5k tow rating.
Minivans are lighter, cheaper, and offer more interior space than any 3-row SUV/CUV except the long wheelbase half tons. I do not know which ones can be towed 4-down, though.
A & A parents of DD 2005, DS1 2007, DS2 2009
2011 Suburban 2500 6.0L 3.73 pulling 2011 Heartland North Trail 28BRS
2017 Subaru Outback 3.6R
2x 2023 Chevrolet Bolt EUV (Gray and Black Twins)