Originally Posted by mtb4life
How do you add more blocks to the tongue when the maximum extension height is reached? Do you let the stabilizer hold the weight of the trailer and retract the tongue jack then add blocks?
DO NOT use the stabilizers to take the (partial) weight of the trailer.
Use the tow vehicle:
When you get to an obviously un-level place, level left-to right while attached, as usual.
You'll have to make an educated guess on how much cribbing you'll need. Stack to the totally retraced tongue jack, if needed. Lift of the tow and get it clear. If you've maxed out the jack, stack cribbing under the tip of the hitch or both sides of the tongue near the trailer's frame and lower onto that. Retract the jack, add cribbing and re-try.
Before heading out, extend the jack to maximum and see how much is available. You'll be surprised. Especially with the foot at full extension.