I haven't had any problems towing deuces with the 915, but I did learn that my 818 on 14R20s is kind of a death trap when pulling a deuce. I'll never try that again.
I had looked at a tru-hitch or other 5th wheel towing setup. Eventually I'll get something, but for now I guess I'll look at some weight box setups for the 915. I guess it doesn't matter for now because we didn't wind up getting anything in Saginaw. Maybe I'll see about butchering one of my M105 trailers to build a removable weight box. I've got 3 just taking up space out back.
Thanks for all the responses.