Thanks for the rapid reply.
I figured if I could safely drive one axle up on a block to change a tire I could lift the whole side using both axles mounting pads (seems like the strongest lifting points and are the same pressure on the frame as when towing).
Once in the air I can support the frame at multiple points along the length. I understand the logic of only needing support in front and behind the spring shackle end points as this again is equal to the loads when towing, I just prefer to stabilize the unit while in the air.
I know I can count on this site for the help I need - when I need it.
Thanks again for your thoughts and getting back to me so soon.
Hap