My original question was:
This is my first time using this forum. I emailed Heartland this question and they referred me back to GMC. Maybe some other owners can give me feedback. We are planning on purchasing a Bighorn 3055RL. My question is - will we have any problem towing that much weight with our 2006 GMC 3/4 ton diesel with an Allison trans.
The responses I got back were very positive - Thanks to all who answered.

Part 2 of my question - can we go bigger? How much bigger? If we do what problems will we encounter? I appreciate all the technical info I have received -passed it on to my husband. As for me - I am a middle-aged BLONDE - keep it simple! Thanks again to all those who answer- Alicia