We use the jack stands used under Mobile Homes. I have a set of four, they are adjustable. I level side to side using blocks under the tires. Put on the RotoChoks. Unhitch, lower the front of the TT and place the two rear jackstands under the frame. Raise the front of the TT to a little past level and place the two front jackstands under the frame. Lower the trailer onto the jackstands and we are solid.
The jack stands are strong enough to support the entire weight of our TT. I got them at an independent RV supply shop.