I would look for something like these at a local RV supply or online:
http://www.bandrstamping.com/LEVELING_JACKS.html
Place two at the front, two in the middle by the tires and two at the rear under the frame on both sides, total of six jack stands. Try to get as much weight off of the suspension to make the RV as solid as possible.
I used these on my 24ft TT and never had a movement issue. I would lower the front of the TT and place the two at the rear. Then raise the front to a little past level and place the two on the front and adjust them so the TT is level as you lower the tongue jack. Finally place the two by the tires and tighten them with a wrench as tight as I could against the frame. There were times when I had the tires completely off of the ground.
These jackstands make for a very solid platform and don't take up much storage because they stack together.