We have a 2016 3990. We haven't had any major problems yet. We have only had it since February 2016. It was used when we bought it. I am probably gonna take it in this week for a problem with the fridge and water pump. The length and size can be a issue sometimes. You need to plan your routes accordingly and check Rv parks for site size. The hardest for us has been overnight stays while we are on the road. Since it has a onboard generator we have started to stay at rest areas and similar places when we need to stop for the night. The Chevy dually should pull it fine. We have a 2013 GMC dually and the only problem I have had is it going into limp mode because of a overboost code.