Jagiven hit the nail on the head.
We use foot long sections of 2x12 under the trailers jacks for more stable footing, and the spin up jacks under the frame on both sides about 1/3 of the way from front and rear also footed with 2x12 for stablility.
We carry a cordless impact driver for raising and lowering the jacks. That alone is a huge time/energy saver. Keep the battery charged by plugging into an inverter and the solar will have it charged up fresh for each days tightening.
It's about as close to wiggle and creak free as you can get in an 18 y/o trailer.
Giving them a tightening tweak daily will help to eliminate any "softening" of the support. The few extra minutes is well worth the comfort/peace of mind.