We had a Toyota Tacoma four cylinder and found it insufficient to pull even our 16' Bambi. It wouldn't get to highway speed without straining like crazy, and often couldn't stay there. Since I loved Toyota trucks, the next try was a Tacoma 6-cylinder and that did a reasonable job except that being so narrow compared to the Bambi, it was exciting trying to use the mirrors to see if someone was passing, etc. This otherwise was reasonable, but not wonderful as a tow vehicle. Since then, we bought another Airstream that required still more horsepower and now I understand why everybody recommends a larger truck. With our Dodge 1500
, V8, 5.7 Liter, the Bambi pulls like it's not even there. And our 25-foot Safari is no problem either. My advice is go directly to a V8 and enjoy everything but the gas mileage.