What 28' Springdale model did you buy? I see a 28' bunk house at 7k dry and 8k dry. That will be 8500-9000 loaded. That's outside nearly any half ton I recommend, including the GM 1500HD.
While it would be an upgrade performance wise from your current truck, I highly recommend something with significantly more wheel torque. That means something new enough to get more transmission gears or something like a diesel or 8.1L with far more engine torque.
If you stick to 4-spd trans models, at least get 4.10 axle.
