Just came across this thread. I have the exact same problem on my 2010 28BH. I got the trailer new in 2011 and had terrible tire wear after 1500 miles. The dealer replaced the axles so I don't know if the original set was rubbing. I don't pull the trailer much but after 3000 miles the tires were slick again so I purchased a new set. When I pulled the wheels I had a terrible rub on the left side. It looks as if the spring hangers were not welded in the center on the frame or possible the floor is not framed correctly. I have about 1/2" clearance on the left and about 2 1/2" on the right. I took several measurements including the saddle distance on the axles. The axles measure the same on both sides, that only leaves the spring hangers or the floor. After several emails to Forest River they said they would send me new axles. They would send a set 3/4" wider on both sides to clear the floor on the left. Now I will have over 3 1/4" on the right, I hope the tire is still under the fender. It will be harder to tow now, the trailer tracking during turns will cause the right sides to come closer to what ever is there, curbs or etc. I will have to be extra careful not to ruin a tire. I picked up a set of spacers to put on the left to give me clearance during the 75 mile pull to the shop. Maybe it will give me enough clearance so I don't ruin the new tires by rubbing. No sign of the axles at the shop yet and the shop said they haven't heard anything about an axle swap. I guess I'll see how it works out.