Same exact wear on my shadow cruiser, we had about 1500 of our own miles plus what ever miles to ship it out to Colorado. We were just under our 1 year warranty so I took it to the dealer. Lippert replaced the axles and the tires. I paid the difference and went with Maxxis tires.
I would take it into the dealer ASAP and have it checked out, several of these lippert axles have been replaced under warranty.
I am measuring tread wear after each trip now to see if the problem is corrected. I think there is an alignment issue as well since my rears wore more than leads. At the first sign of uneven tread wear I am hitting the alignment shop.
Edit Below:
The H188ST are produced for WD (World Distributors) the primary distributor in the US is tredit tire. From what I could find out they are a package rim/tire combo sold to mass markets like RV and boats trailer manuf's. There is not much more info on the brand.
When the dealer replaced my axles they found the bearings were nearly dry also, I am hoping new axles and repacked bearing solves the issue but only time will tell.