I have heard the rumor of those cracking also, but never saw any real life proof though. What I have seen real life proof of however, is drive train failure. My brother has a 2005 Avalanche, and the guy I sold my other F-250 to has a 2002 Avalanche. Both of those have had both the rear-end and the transmission replaced/rebuilt. The guy I sold my old truck to used his to pull his trailer, which would be about the same specs as yours. My brother barely hauled anything with his. And I have heard of quite a few other Avalanche's with the same issues. Now, to be fair, both my brother's and the guy I sold my old truck to, they were both the 1500. I would have to believe the 2500 with the 8.1 and 3.73 is a much better built unit, but seeing all the past issues with towing by the Avalanche...just saying.
Now, that being said, I hope it does what you need. And welcome to the wonderful world of RVing! That is a nice camper...you're gonna have lots of fun with it!
Ed and Sharon
2010 Wildcat 28RKBS
2011 Ford F-250 XLT, 6.7L PSD
Ride-Rite Airbags and Airlift wireless remote compressor...nice!
I thought I was wrong once, but I was wrong!