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I use a 8 ton jack that fits nicely under the u-bolt section when tire is down or flat. Have completed this procedure on many trailers including duallies with no problems or danger (emergency brake on and other tandem wheel on trailer chocked). The are many times when you may be off road or in the woods that all these blocks may not be available. The important procedure is: do it in a safe manner to ensure that axle will not come down when that wheel is off!!
At home and in the shop we block and lift with a 20 ton jack from the frame immediately in front of or behind the wheel that is to be removed. We have a total of 5 various trailers on the farm, so with 20 tires and wheels there is always a repair to do because of the application and terrain encountered. I always take caution when working with wheels and tires plus it is nice to have a helping hand when in the stranded situation.
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