For stands I bought mine in the US from Harbor Freight and the higher capacity ones usually support the Jeep highter. I have a set of these that are rated at 6 tons and extend to 24 inches. I Also have a 3 ton set that I find too short for the jeep. The heavier ones have a bigger base and provide more stable support.
http://www.harborfreight.com/6-ton-jack ... 38847.html
For a "trolley" jack, we call then "floor" jacks in the US, my experience here is the same, heavier gives highter lift needed for the jeep BUT a inexpensive one like this tend to leak down because they are too cheap
I have one and it holds the jeep up long enough to position the stands listed above. I also have a 32 year old Sears Craftsman jack that holds fine but it was three times as much $$ 30+ years ago 
http://www.harborfreight.com/automotive ... 34271.html
Joe
