Don't worry about easy, worry about safety no matter what it takes. I've dropped and replaced 4 belly pans. It is not a fun job, but quite necessary for a good frame inspection and a good renovation job. I wire brush the frame, I paint the frame, I repair the frame if needed, I install ridged foam under floor insulation, and a rivet up new belly aluminum. It gives me nightmares to think about it.
Using my heavy duty floor jack, I jack on the axle plate or the frame rail just behind the axle plate. I use heavy duty 6 ton jack stands on the frame rails just forward of the entry door on the frame rail, and just aft of the rear axle. Then I do the same thing on the other side, and then back to the curb side. I go up about 3" a try as I don't want to be unstable on the jack stands. I use a creeper while under the trailer, so I want about 20" clearance for doing the work.
Others may have better ideas, but this is what I did. By the way, I like Littleton. Your mainstreet is very neat, like a small town is supposed to be.
WBCCI #8607 VAC Region 11
KnowledgeBase trailer renovation threads: 69 Globetrotter, 76 Sovereign, 75 Overlander, 66 Trade Wind Such fun !