I have a 2015 Nash 25c and so far it has been great. My tv is a 07 mega cab 5.9 2500. It tows the camper and my family and all of our stuff well. Your 3500 should work well for what you are looking for. We have been camping at state parks and boondocking for the last 3 months. I'm really glad I didn't go bigger as some of the campgrounds have been tight! I'm not afraid of a dirt road and feel like the clearance on the camper is adequate. But I also don't kid myself that it is truly off road capable. I'm nearly 55' feet long and 15k! I feel like the Nash is built well and seems to keep the heat in relatively well. We have camped in temps in the 20s and the heater will run, but not continuously, We have had no issues with frozen tanks or lines. From what I have seen, there are a ton of units out there, you just have to find one that works for you, then take care of it and try not to exceed its capabilities too often! Good luck!
