1 Ton Dodge towing and braking a MS 38LR3

[56ford]

We have a 2001 long bed Dodge diesel 3500 Ram Dually automatic, 4X4 with a 3.54 rear end. We do not have an exhaust brake, but are thinking about buying one. We are in the process of buying a 2005 MS 38LR3 with 17.5 in wheels and disc brakes with a good trailer brake controller; we want to know if we should anticipate any problems. The current owners said it had a weight of 15,620 pounds (dry) when they loaded it with clothes and other contents, but had not filled the tanks. They feel confident that its current weight will be under 17,000 pounds and will be having it formally weighed for our information. Does anyone have an opinion on this? We want to know if we should be able to confidently tow up inclines and readily brake on steep inclines. We want to travel to Alaska and be able to handle any mountainous areas. Also is this Fifth Wheel too long or will the three slides pose any problems if we want to go to state parks?
ANY HELP WILL BE GREATLY APPRECIATED!