2004 Trailmanor 3023 tire change

I received a great quote from a local tire dealer for three Maxxis ST225/75R15 tires-$300 out the door, mounted and balanced.

That was the easy part....now to get the tires/rims off and up to him.

The spare is not problem....but what is the best procedure to remove the two wheels/tires while leaving the Trailmanor sitting until I return?

(Using floor jacks/jackstands, or will the built in jacks hoist it high enough to remove the wheels?)

Also, is it best to open the trailer slightly to get at the wheel wells, or to fully set it up?

When camping, the wheels were still touching the ground so I never tested the ability of the built in jacks to raise it high enough to bet them both off of the ground.

Thanks in advance for any help!