I tow a 23' CC with twin V4s on a tandem axle trailer with disk brakes. I pulled this rig for 10 years with a 1993 Ford Explorer Sport in south Florida. Granted the Explorer was undersized for this tow but I never had a handling problem. <br /><br />I recently got rid of the Explorer for a 1999 Yukon which is the right size for my tow and has the power that the Explorer did not. With the Yukon it it tows just fine up to 55 mph and then gets squirrelly and starts fish tailing - not violent but fish tailing just the same.<br /><br />I know this is usually due to a light tongue weight (while it is heavy I don't know the tongue weight or %) but the tongue weight hasn't changed with the Yukon. One thing I did notice - with the Explorer the main rails of the trailer were parallel to the ground. The ball height with the Yukon seems to be a bit lower. Could this be the cause of the fish tailing?