Greg Trigeiro wrote:With 66% of the car weight on the rear axle of the car, is the 18ft trailer needed to place the car far enough forward?
You want at least 10% of the trailer's load to be on the tongue when everything is aboard to prevent swaying at speed. The placement of the axles fore and aft has a large influence on this balance, as does the way you distribute the load. With a rear engine, 911s present a unique challenge to getting this right, but adjustments can be made by front loading tools and tires, etc. I think you will be able to do it with either size trailer, but talk to the manufacturer about their design in relation to rear-engined cars and consider adding a front tire rack as Jad says, just to make it easier to insure enough tongue load. A 16' box has worked fine for me, but I also have a front tire rack and compressor installed in the V-nose of mine.
TT