Michael W's method with the tongue jack and two Atwood type stabilizers worked very well for me on a tent camper I used to own. What I liked about it was that there was enough length on the stabilizers that you put the tripod arrangement on some pretty unlevel ground and it would feel solid.
BTW...Dean...glad to hear your getting after it...I bought Comet plans yesterday...I guess I'll go searching to see if I can get some 5 x 12 aluminum here in Juneau and so I can get the width to 5 ft. Have fun welding!