I'm building a trailer now. I have a dexter torsion axle. I am putting elec brakes on it. I am using my 17 inch Jeep wheels and tires that I took off when I put my 35's on. I am using an adaptor for 5 on 5 - 1.5 inches thick with a large hub hole. Yes they will not be hubcentric like the jeep wheels are made but I'm not worried that it is Lug carrying as the trailer should not be much more than 1500 lbs and the lugs are rated for much more that this.
Here is what I'm using.
I measured to know that I needed 1.5 inchs to set my wheel where I want it.
There are so many different adaptors you shouldn't have a problem finding what you need. If you need to widen the fender then do so but I don't think you'll need to. Good luck.
Here is what I'm using.
2 Wheel Spacers Adapters 5x5 To 5x5 1.5" - 5x127 To 5x127 - Jeep JK 1/2" Stud | eBay
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There are so many different adaptors you shouldn't have a problem finding what you need. If you need to widen the fender then do so but I don't think you'll need to. Good luck.