Mannyqc,
We have towed our smaller Oliver with a Volvo xc90, a 1/2 ton Chevy Silverado (2005 stepside, 2 door, short bed), and now with a 2008 Ram 1500 4 x 4 quad cab.
The Silverado gave us the most nimble combo, tighter turning radius, plenty of power. We still use it occasionally, but it's my daily driver and work truck now.
We got the 4x4 in late 2008 for the narrow mountain gravel roads, and the ability to carry passengers, which we need from time to time.
The Volvo did fine in the relative flats of the southeast, but would, in my opinion, be lacking in steep mountain passes. And, we like driving trucks as tow vehicles.
Good luck in your decision. The smaller Oliver was the only choice when we bought hull #12, but we still love it, and it's perfect for us. All the trailers live really big on the outside.?
Sherry