Sue,
I've recently revised our stabalizer approach on our 32' Coachman. I just put a jackstand on both back corners & then put a bottle jack centered in the front. That 'tripod' arrangement is stable and is the easiest approach I've found. The best part is that with your tongue jack already installed, you can eliminate the bottle jack.
Just get the thing as level as possible before you start but with a slight 'rear up bias'. Then level side to side with the rear jack stands. Then crank up the tongue till it's level and steady. You can get a cup thinggy to put the wheel in so it won't roll.
I picked up a set of 4 nested jackstands for about $20. The set only weighs a few pounds. Like these:
http://www.easternmarine.com/ULTRA-F...k-48-979004-0/