First, many people use blocks of the sort you referenced. These can be used under the wheels and/or under the jacks. Second, owning a 2007 you already have your trailer lifted. This became standard sometime during the 2006 model year.
The "normal" way to level is to get it correct side to side using the blocks (or 2x6s or 2x8s, 2x4 is pretty narrow). Just pull the TM wheel on to whatever combination of blocks you need to raise the lower side. Since you are now close to level side to side, you can use the tongue jack to level front to back. You are very close now, so you can set up your TM. Then fine level using the top of the refrigerator as suggested. You can now fine tune front to back using the tongue jack. Then fine tune side to side using the scissor jacks. I only use the scissor jacks to fine tune. They are plenty strong enough to support the TM, but I find using them to perform major leveling is very difficult as major adjustments tend to tweak the TM frame, making accurate leveling extremely difficult. You will probably get many suggestions on this as everyone has their own 'method', but m0st will just be variations on a common theme...
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