New or used, and what size range?
GM has some towable 4WD SUV models and in different size ranges. Acadia/Traverse/Enclave and Cadillac SRX for the larger crossover SUVs, Tahoe & Suburban in the larger truck-frame SUVs. None of the smaller ones, though.
Ford has the Edge, Exlorer and Flex AWD models, plus the bigger Expedition too.
Jeep Cherokee, Compass and Wrangler are all 4WD towable.
Most any US brand 4WD pick-up truck will be towable, whether mid or full size and Ford, GM or Ram.
Suggest you peruse the Dinghy Tow Guides from FMCA or Motorhome Magazine for ones that might suit your wants and needs.
http://www.motorhome.com/download-dinghy-guides/