The outer diameter of the hub bore (shaft) portion of the Dexter Trailer Idler Hub Assembly part # 8-258-5UC1-EZ is 1.986" outer diameter so your wheels will have no issues clearing it.
The hub flange diameter is 6-1/2" which allows you to use 13" to 15" wheels on the hub. view full answer...
I pulled up pictures of your 2008 Viking Epic 1706 and found that it uses a side mount trailer jack. So since it is welded on you could use a Pro Series swivel jack part # PSEJ10000101 mounted on the other side since this would bolt on with included u-bolts. Or if you wanted to try and mount a new jack to your current mount I would need to know what brand and model jack you have now. view full answer...