Would a 2 ton hydraulic jack be sufficient for DIY winter/summer tire swap? I believe the curb weight for a GLK is more than 2 ton but when changing tires, you technically only lift up a quarter of the vehicle. Is my logic making sense?

 

Makes "cents", but not worth it.
Spend for a heavier jack. The 2 ton's I have seen and used wont lift high enough for a SUV, and you will find yourself building some type of dangerous extension to get enough lift to raise the tire, or positioning the jack in an area where it is subject to side load movements. The frames of the 2 ton's aren't sturdy enough to resist side loads and the vehicle may topple.
Try this 3 ton or better, and I would buy from a place where you can get repairs at a later date.

 

You should be more than sufficient if you jack up one corner at a time, I don't mean with the $20 2-Ton jack you buy from Walmart.

I got two of these Jack from Barbor Freight to lift the whole front OR rear wheels up at the same time. Changing wheels out is easy and take less time than to do one corner at a time.

http://www.harborfreight.com/2-ton-l...ump-68051.html

 

I have a dumb question...where do you place the lift point of the jack if you are not using the lift points on the side of the car? Will that not damage anything on the car if you use a different lift point? I have a 3 ton hydraulic lift jack but didn't have the ***** to use it as I am too afraid to use it and damage a expensive car.

 

ditto... make sure that whatever jack you get is able to raise high enough for a SUV.