Stabilizing jacks...and tire protection for 2+ year stay

15000 lb trailer, and ditching the jacks lightened the load?? by how much percentage wise?

A set of six or eight cheapo stands from Harbor Freight should support that beast, grab a cheapo trolley jack while you're at it.

Protect the tires? How about take the wheels off and slide them under the rig where the sun don't shine. If it's 2+ years, you won't be needing them anytime soon, right?