If you can afford it, getting the 225 Maxxis and new rims would be the best way to go. The 225 is about 1 1/4" taller than the 205 so also make sure there's enough space between them when on the trailer. You might be able to find some aluminum rims that are 6" wide.
As mentioned, be sure to have the new tires balanced and install steel valve stems.
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M.I.L is self quatanting in Jacksonville Zoo