If I recall, you said that, as you unhitch from your TV, there isn't enough travel in the landing gear to lift the rig to level, even if you put all the blocking that can fit under the landing gear.
That leaves you with the obvious but unwise. Jack it up in stages. Get the most lift possible from the landing gear, add jacks/blocking behind and as close to the landing gear as possible and lower the rig onto that support, then raise the landing gear, add more blocking, and take another bite at the lift.
Perhaps, then reinforce the auxiliary blocking immediately behind the landing gear and leave it in place.
Whatever you do, this sounds a bit precarious, but it sure beats the hell out of trying to run the back of the TV up ramps to lift the hitch. Hooking up again would be a nightmare...and dangerous to boot. (Perhaps in 4WD Lo Range?)
It sounds as if you have 10 pounds of RV in a 5 pound spot. 42 feet is a LOOOONG fiver for what's obviously a spot designed for a "shorter" rig. Good luck.
Jim & Renee
2020 Jayco Jay Feather X-213
previously 2014 Forest River/Rockwood HW 277
2006 Ram 1500 4WD Crew with Firestone Airbags
Every weekend boondocking in the National Forests or at Lake Vallecito