Vehicle stabilty

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Hi! 2 months ago I purchased a 1997 2 door convertible 1.6 16 valve 4x4 with 132k miles. I am working my way through the vehicle using the help here at fixkick. Now on to my question. My first concern has been safety, and the truck now rides great with new General Grabber 205/75-15 tires and aftermarket oem type dampers at all corners. I am running 23 PSI in all tires per sticker on the door jamb. Today while going into work just outside Philadelphia, PA I hit freezing rain. Now everybody had to slow dramatically, but it was all I could do to keep the back end from fishtailing during steady cruise. Acceleration and braking seemed fine, but I could feel the rear tires let go and come back while going straight at speeds ranging from 20-40 mph. The roads were small and medium sized secondary roads with rural type highways. I emphasized smooth transitions and avoided incident. To those more experienced than I am with the Tracker, does my description sound typical? Is this the nature of a light weight short wheelbase truck? I love my Tracker but I was shaken by the experience. Thanks.