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Revisiting this now that we got our new Expy EL. 3.31 axle, HD Tow Package has the rating at 9200#.
Calculating out the curb weight, total payload, and the WDH weight gets me to about 7000# total load without the trailer.
With a GCWR of 15,200# that should leave me with a 8,200# delta for the trailer. I've also heard that a good rule of thumb is to size your trailer at 70% your tow capacity for ease of use and room to scale. That would be around 6,500#
I guess to be on the safe side I should look somewhere in the middle of those numbers, or err on the lower side? The trailer we are looking at is 31', dry weight of 5866, and GWVR 7635. That feels like it's getting pretty close to the max.
Hard to find anything much lighter that can hold multiple kids, dogs and cargo.
Thoughts?
Here are my general thoughts after researching this extensively and taking into account my limited experience.
You are in a very similar situation as us with the vehicle (although you have the EL) and trailer size.
Your vehicle can tow it. Our vehicle towed ours this weekend; however, I am still a little worried with the movement it makes when passing semis. Your trailer is about the same length as us so I would assume you'd get the same movement. If you are seasoned at towing, you will likely fair better than me; however, it is something to consider. Many people have recommended to get the ProPride3 hitch. I got it and am installing this weekend, so I can give you real life feedback next week. So, I'd recommend a very good hitch if you plan on getting a trailer this size.
As for weight, I also think you're fine. Some of your trailer weight will be figured into the payload. Your tongue hitch weight will be in that number. That number will change based on how much you load into the trailer but it's a good starting point. For reference, our trailer is 6100# dry, #890 tongue hitch, and 8000# wet. Our total gross combined weight w/ our trailer this past weekend was 13,340#. This was a quick trip about an hour away, and I purposely didn't pack some stuff because I wanted to make sure our weight was good; however, I figure I would have only add about 300-400 more pounds if I brought all our stuff. I think if you pack good, you can make your numbers similar to ours. Also, what I've read is that you rarely reach the gross trailer weight. I was told that an average family will add about 1000# of cargo. That would put you about 6600-6800#. If that's the case, that would put you in line w/ our total numbers and ~13500#.
I've also read that some of those gross trailer estimates assume you will carry a full tank of water which could add 400-500#. We are starting out only camping at spots that have full hookups, so we will not travel w/ fresh water. If you plan to boondock, consider the added water weight into your trailer weight.
To sum, I think your Expy can tow it, especially if trips are short or fairly flat. When you start considering trips to CO, that is where I think you might have a little trouble. Those trips will also likely have more cargo because you'll need to pack for longer trips, so your total weight will increase. The older your kids get, they will also add more weight. For us, While our Expy can tow our trailer, I have already started looking at 3/4 ton vehicles. I'm not in a hurry to buy, but I won't be slow to pull the trigger if I find a good truck.