I just finished helping a friend do all the math on the new Frontier.
Be very careful with Tow Ratings. They usually mean little to people that are camping with passengers and cargo. They basically tell you what the maximum towing capacity of the truck is "Empty".
I would strongly recommend that you put all the figures in this calculator before you make a new purchase that you may regret later.
http://changingears.com/rv-sec-calc-...eight-tt.shtml
It's important that you use real figures in this calculator, so it will take some time to get
all the correct facts. It's best to assume that your TM will be at or near it's GVWR while traveling. Also be realistic about the weight of cargo and passengers. You should use a figure of about 500# tongue weight (if you haven't already weighed it).
When we did the calculations for my friend (using a 20% safety margin) she was maxed out at 3800# for the trailer with that truck. That's still not bad but it's a far cry from 6000#.
I just didn't want you to think that the Frontier is something that it isn't. It should be adequate but just understand that it may be barely adequate depending on what you carry.