I'm pulling a 40' toyhauler and wouldn't have less than a 12 ton bottle jack for changing a tire. The 5 ton ones are a lot of work.
Trailer Aid won't work with a triple axle, and make sure whatever jack you buy that it will fit under your spring perches with a flat tire. Nothing worse that sliding that jack under there only to find it won't fit under the axle with the tire flat.
I carry a 24" breaker bar and a click-type torque wrench. They're not that big so why not. Like several people have suggested, try everything for fit before you really need it.