recommended travel trailer toy hauler

With a 1500 you are going to be a whole lot less than 40 feet.

First determine the payload and towing capacity of your truck. Then estimate how many pounds of passengers and gear will be in the truck because they are subtracted from the available payload.

When shopping for trailers do not get distracted by the so called empty/dry weight. You need to be comparing the GVWR of the trailers with the towing capacity of your truck.

You're going to be limited by your trucks' payload which unfortunately won't be enough to carry much of a tongue weight once the seats are filled. Toy haulers have high tongue weights to counter the garage weight in back so even the lightest trailer will push 1k which in a half ton will only leave a few hundred pounds for passengers and stuff. I can guarantee you won't get anywhere near a 40'er without a bigger truck. Forget the magical tow rating number as well. You will far exceed the payload, tire , and axle ratings before getting anywhere near it.

I'd suggest loading your truck with passengers and gear as you would normally expect to travel and go to a scale. Subtract that weight from your GVWR. The number you have left is for the trailer tongue weight and the hitch. Figure 75lbs for a good weight distributing hitch, that you will need, and approximately 15 percent of the loaded trailer weight as tongue weight. It'll be a small trailer with mostly garage area. This is only 18' and if you look at the specs it would probably push or exceed your trucks limits unless it was just you in the truck and everybody else followed in the Traverse.