Spent about 90 mins out there today, the 2.75 yo grandson arrives soon to stay for the week.
Got the BAL C-jacks installed.
I used 22" in the back attached horizontally to the frame. In the front the A-frame was in the way and I didn't want to move the jacks that far towards the rear or build them down under the A-frame thus losing ground clearance so I did 25" jacks attached to the floor parallel to the frame, I'll use the tongue jack to take up the weight of the trailer although I don't think it's really much of an issue.
When cranking them up they were pretty creaky and squeaky so I squirted some lithium grease on the ACME screw and other moving parts. This is 5" of lift, they might make 6" fully extended.
These are really stable, I gave it a good shove sideways and the jacks skidded on the floor but they didn't really lean or twist, got up on there and busted loose with my best rendition of the funky chicken and still not a lot of movement, much more stable than I imagine scissor jacks would be based off my experience of changing a few tires with those things.
