On Friday, June 6, 2014 3:44:32 PM UTC-7, son_of_flubber wrote:
Tow vehicle is 2004 Volvo XC70. Single seat glass glider.

Every time I've had the problem you describe, the solution has been one of the following:

* Fix the suspension of the tow car. New shock absorbers, and replacement of any worn or crumbling suspension bushings. And, trust me, the AWD versions of the Volvo P2 chassis cars have plenty of opportunities for those. My next snow car is definitely gonna be a Subaru; I'll take a head gasket change over that clusterfutzery any day.

* Lengthen the trailer tongue. Glider trailer tongues are way too often too short; sometimes an extra 4" or so will make a huge difference in stability.

Thanks, Bob K.