It does not look like you have been here in a while, so I hope all is well with you and your family. I noticed that you have the same big sky that I recently got myself. I also have the same truck that you have except it's a couple of years older with the 454 engine and automatic transmission. Currently it's at the locale camper shop having a new undercarriage installed. My question to you is how well does your older 3500 dually handle the weight of the 3850fl. I have been using an ap to check weights and everything is within limits except for the tongue weight. I am sure the Onan genera that's in installed in the front is part of the reason. Hopefully you can shed some light on this for me. Thanks for your time. Steve