westend wrote:
The 2 ton jack will be enough.
A 2ton jack should work BUT it is going to take a lot of man power effort.
A 4ton jack will take considerably LESS manpower effort but will take more "pumps".
A 10 ton jack will be nearly effortless but will require considerably more "pumps"
I typically use a 2 1/2 ton floor jack while at home for checking the wheel bearings and let me tell you... even with the LONG handle it really takes a LOT of effort.
My recommendation is go with the highest jack rating possible to reduce your effort.
However you need to check the minimum and maximum height of the jack.
Too tall and it will not fit under your trailer with a flat. Not enough height and you run out of jack before you can get a new inflated tire on the hub.
Bigger jacks also have something else going for them, stability. They tend to have a bigger base and makes them much more stable and less tippy. This can be an issue while out on the road, you often will only have the side of the road to work with which is almost never flat.
Make sure you pack some pieces of wood to use as cribbing, a 2x10 cut at say 10" length can give your jack a "platform" to sit on which is not going to sink into soft ground. A few short pieces of 4x4s can be helpful.
Never get under the trailer with only a jack, use some wood blocking under the frame or a couple of adjustable car stands under the frame.
Safety first...