Getting myself ready to purchase a 4-ball bag and have been checking out the newer Track Premium, Columbia Pro or Ebonite Grand Tour. Wanted to see what type of bag some of the bowlers here have and which type is easier to handle overall? My main thing is getting a bag that won't constantly tip over and simple to get in and out of the trunk of the car.

Well, I did look at those like the ones from KR and Brunswick but the wheels that are on the Track and Ebonite bags rolls much smoother like the Track Premium 2-ball bag that I currently own.

Over the years I've had two ball rollers, three ball rollers and four ball rollers.  The worst of the lot were the three ball rollers which were always hard on the back lifting into the trunk.  They took considerable abuse and never lasted more than a year.  I did considerable research a few years ago and decided at the time that the Rolling Thunder four ball bags were the best.  I'm not certain if that's still true or if something better is now available.

I vote for the 4 ball stacking roller.  It is much easier to lift 2 balls into the car.
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USBC Silver Level Coach

Funny...I just had this same conversation with a customer the other day.  The stacked rollers are definately the easier option of lifting in and out of a car from a pure weight standpoint.  The main advantage I see of the upright rollers are tournaments and the ability to roll the bag through the maze of equipment.

Just depends on which one is more important to you.  Personally I used a stacked 4 ball roller.  I tried the 3 ball and just didn't like it, ofcourse if I had an SUV things might be different.
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-Chris: DJ's Pro Shop : Auburn, MA