Bottle jack is my vote too. This is not a single axle, but a #5000 TT so just imagine that the front axle is your single axle and place the jack just behind your single axle tire on the center of the frame. (it's actually a "6 ton" jack!)
Only jack it enough to take a little weight off the tire and then break loose the wheels lug nuts. Now jack it so the tire comes off the ground and remove the lugs and change out the tire. Spin the lugs back on enough to seat them all and then lower the jack enough so when you tighten up the lugs, the wheel won't spin on you..
I have one of those "X" type of lug wrenches that have 4 different size sockets on each end, but the best thing about those is you can get a lot of leverage on them because you can grab 2 of the bars to twist the lugs off and that's a big advantage!
But, you know, in over 12 years of towing my dual axle trailer, I've only had to change a tire one time on the side of the road... And that was 11 years ago!! :)
Good luck and if all else fails, go with 352's suggestion... ;)
Mitch