OK, have you seen the type of swingsets/playsets that look like a boxy fort in the center with the two by fours that extend out from the top to hold a swing or bar? If you did something like that you might be able to mount it to a wagon that you turn. The tree trunk would need to be thick to cover the fort structure--which is needed to keep the bar stable. You would also need to bolt it to the wagon.
One of the easiest ways to do this is to imagine for a second that the sides of your roughly square tree trunk are 2' x 6' platforms that you built, but you happen to use 6' -2x4s even on the 2' sides instead of 2'-2x4s These extra long pieces are going to overhang the platform and are going to be your bar ('branches') and also your anchor ('roots') to your moving wagon. You create two sides of your tree this way.
The other two sides of your tree trunk are plywood pieces cut 2'x6' with a notch cut out to accomodate the 2x4 'branches' that are going to jut through. You also need 2'-2x4 connectors on the top and bottom, to connect the front and back sides of the tree. Now you have a tower that is 2'x2'x6' with two 'branches' hanging out and two 'roots' on the floor. The plywood on four sides of this structure is important to make it very strong, and impossible to torque, so don't just make the structure, cover it in plywood!! Now anchor the 'roots' and the base of the tower by bolting it to the wagon.
Test carefully and err on the side of safety, before use to make sure that all is sturdy and not possible to topple. Also check the wood to make sure it won't split under load. If needed attach to a bigger wagon to counterweight the kid's movements. This should work, but it is a suggestion offered in good faith, not warranted--So make sure you would be comfortable with it because somebody's kid is hanging upsidedown. If at all possible make this yourself, don't let kids take over this construction. Also make sure that only softgoods decorate the area under the kid.
Now you can cover it with chicken wire, rug pieces etc.. and paint it to be tree like.
If the wheels of the wagon make it unstable, consider having the wagon platform on sliders or rug sections instead of wheels, or use lower wheels.
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