Well up till about 2-3 months always had a small 2 ton hydraulic floor jack stashed onboard in a handy spot in the front through and through. That was till 1 day I needed a 2nd floor jack in the garage and that thing lost its oil and proved its worthlessness. So replaced it with a scissor jack. Now a few very important things IMO need addressing first, my trailers weight which is 7000 lbs true weight, and how much space between the ground and where your jacking onto it with a flat tire. I also believe under the axle so through the previous floor jack into the garbage and got a failsafe mechanical scissor jack 3300 lb, I had a bracket welded onto the top and jack for under the axle ubolts, plus I threw away its crank and with a file modified the end so I can jack it up with a 6 sided 1'' socket(I think it was a 1 inch socket) and with the 1/2 inch drive ratchet. I made a board that is mounted in my through and through that everything needed for tire problems is mounted to. Mounted to that board is my strong arm plus 13/16 socket, ratchet with it's 1'' socket, 3/4 '' socket, jack, things specific to changing the trailer tire, a light, pill bottle with grease for hitch. Everything you'll need if that dreaded situation should arise. And maybe this might be one time when fate will hold true that with any luck at all I'll never need any of it. But probably not that lucky.
https://www.amazon.ca/Powerbuilt-640...motive&sr=1-22