Hub swaps on a trailer is super duper easy… you just take off the Toyota hubs by removing the lock nut, lock washer, and torque nut. Boom the hub slides off… next grab your Jeep hub and reassemble in reverse order… the torque nut is the tricky one, spin the hub counter clockwise as you tighten the nut down until the hub can’t spin any more. Then back off the nut 1/4 turn. Place the lock washer on, adjust the night slightly until the locking tangs make contact with the correct spot on the nut. Lastly screw the locknut down as tight as you can and bend up the locking tabs of the lock ring to secure the nut.
It probably took me twice as long to type all of this than it takes to swap one hub.
This also assumes you have standard trailer axles that take normal bearings… if the axle uses uni-bearings, the process is similar, but easier, as they use a special torque/locknut combination.