My initial search came up with a 5x150mm bolt pattern. I don't think I've ever ran across a trailer hub with that pattern.
I would suggest spec'ing your axle dimension to allow for the extra width of using a 1.5" wheel spacers/adapter. There are plenty of company's that make 5x5 to 5x150 adapters. This method would also allow you to use a different wheel and/or adapter if you change your tow vehicle. I'm experiencing this cause/effect right now. Started out with my Tahoe being my primary tow vehicle and then we decided to go ahead and get a Jeep. I didn't go the wheel adapter route when I ordered my custom axle for my trailer and now I need to use adapters, for wheel hub clearance reasons, and need to have a whole new, narrower, axle built to allow me to run wheel spacers. Lesson learned.
Just make sure the adapter has the proper stud size/thread pitch for your wheels and lug nuts.
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