For a double axle trailer, I have never used a jack to change a tire. I put leveling blocks under the good tire (high enough to lift the other tire and provide clearance to put the spare on), and either back onto them or pull onto them. Then I change the spare, pull off the blocks and head on my way.
Even with a loaded trailer, the additional weight on the one axle for the short duration of time it will take to change the spare will not be an issue.
Finally, I keep a Cross style lug wrench in the front storage of the trailer.
2015 White Hawk 25BHS Glacier Package
2004 Dodge Ram 2500, 5.7 Hemi, 5Spd Manual
2008 Arctic Cat M1000 SnoPro
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