I used at one time the stabilizing Jack's used on tts. They worked, but having to almost get under to place was a pitb. Had auto levelers installed. When it was dry out, not bad. Bad weather, forgetaboutit!
2012 SunSeeker 3100SS Toad-1962 Futura Average 100 + days camping
The only way to stabilize the unit is to put a solid link between the frame and the ground.
Leveling jacks do that and more. Crank down (manual or electric) stabilizers will do the trick for the most part.
Jack stands will work (even the light aluminum camco’s that you can get at W-Mart). Blocks and shims will work too. So will bottle and scissor jacks. Those will require crawling underneath. Consider where you place the jacks if you put any real weight on them.
Almost a week from the original post and the OP has not responded but I would highly suggest adding auto levelers. What you invest now you will most likely get most of it back when you sell or trade, not to mention if the purchaser was looking at 2 comparable units he/she would most likely go with the one with levelers.
Big Foot usually has the Platinum on sale. Although not a 4 point automatic leveler it will do front and back and you can manually finish leveling. No crawling under the rig except to put pads under the jacks if you so desire.
2016 Forester 3011DS
2017 Toyota Corolla SE toad
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99 Terry 31G