[Land-speed] Towing a Race car

[Kirkwood]

10% of the gross towed weight is what is usually recommended for tongue
weight. For heavier trucks and loads it may sometimes be as much as 15%.  I
dislike air bags because there is no spring-constant.  However, you will
want the Lincoln to be perfectly level. Doing so puts the proper weight
distribution back on the FRONT axle. The problem with the Lincoln is the
long "overhang" distance from the rear axle. Air bags may be an easy way you
can "fine-tune" to get the car level after everything is loaded. All the
recommendations are spot on, especially the need for sway control or weight
distribution hitch.  A weight distribution hitch greatly helps with rear-sag
and may negate the need for air bags. 

 

If you didn't want to use air bags then weight the trunk equal to what you
calculate your tongue weight will be (10% rule). Measure the stock spring
sag and take that dimension to a spring manufacture.  They will be able to
calculate the correct spring-rate and spring to be installed. The trouble
is, after the load is removed the car will arch up in back. With air bags
you can air-down easily for a stock height.