A Casita, even the heaviest, is well within the towing capacity of a five or six-cylinder midsize SUV (or crossover) like Explorer, Trailblazer/Envoy, Highlander, Pilot, Pathfinder, Journey. Also GM's Traverse/Enclave/Terrain (which replaced both minivan and midsize SUV). I'm not sure which models from the Korean manufacturers. Assumption here is it doesn't have the 4 cylinder engine option, does have factory trailer tow package (I got caught on that when I bought a Durango).
Any full size SUV (Expedition, Tahoe/Yukon, Durango, Armada, Land Cruiser or their luxury-car twins) would be more than capable with the smallest V-8 offered. Again, look for factory towing package.
That's for Casita (or Scamp) which are exceptionally towable with small frontal area and maximum GVWR of 3500 pounds. Other larger "lightweight" trailers you might have to check on actual weights (lightweight is only relative to a heavier trailer of that size) and frontal area issues for the midsize SUVs, as well as capability of SUV structures to handle weight distribution hitches.
A couple in our RV club successfully towed an AmeriLite 19-footer with a Highlander for several years, but not very far and never very fast.