I have a 2006 8314 and i had to change out an axle because of a bearing failure in 2009. I have posted a pic of the axle i had to replace.
The pic that you are looking at was taken while i was laying on my back looking up. There are only two bolts that hold one axle each in place and they are located on the back side of the flang mount, it's hard to believe but this is the way it is design.
I had made a phone call to Forest River and Alco axle company about the way they were installed and both said it was correct, one bolt on each
Now the other reason i had called Alco is because i had another issue with the new axle, if you look at where the hole is located you will notice that the flang that is welded to the axle dose not set flush to the bottom of the frame but the other side dose ( that pic is not shown) they welded the two flanges out of square from each other so only one side is flush and this side is not, i was told by Alco's Engineer that it was ok, just make sure that when i install the axle to make sure the axle is pushed to the back as far as i can get it.
I email Alco pic of my issues with the axle and it toke two days for them to get back to me on how to handle this, so far i have not had any problems with this and it has been two years.