I did my 2H H55F combo on a 1 ton at the 1/4 ton setting. I couldn't reach any other way! I know I know, it was a gamble, but I was very carefull and it went well. Talk about safety margins though!
Saving up for a 2ton btw!
I borrowed the AC Delco 2 ton and used it on the 1 ton extension. One thing I would have done differently is pull the pan while it is still in the truck where you can break the seal of the gasket with a 2x4 and a bottle jack against the frame. It was a bitch to get off when out of the truck and you don't need to lift the motor as high to clear the front crossmember with the pan off.