The rear stabilizers are part of the frame. The diecast nuts are a typical failure point and are available as a replacement part. UK caravan dealers are the typical source of parts for that chassis.
Everything from the front tub goes through the trailer junction box on the frame and then to the inside of the TAB (at least in my '21). The negative circuit (wire) from the front tub goes to junction box #7 terminal, then from there to the negative bus bar besides the WFCO. The positive battery circuit (wire) from the front tub goes to junction box #6 terminal, then inside to the WFCO battery wire (also #6).
I also moved my batteries inside w/o cutting any holes for wires. You can splice into the the WFCO battery #6 wire. Ask if you need more details.
The red handle on the side loosens the entire shaft assembly. The crank on the top provides about 8 inches of adjustment. When using, you lower ther entire assembly to a couple inches above the ground, tighten the side clamp, then crank the wheel lower as needed to lift the trailer tongue. When done, retract the wheel until the fork blades engage in the slots on the shaft tube. Then raise the entire assembly as high as possible for ground clearance while traveling.
Re: I can't find anything on this forum or on YouTube concerning T@B stabilizers