The 315rlts is a bit tricky to load. It is pretty tongue heavy, which your dually will have no trouble with. Make sure your WD hitch is up to it. My trailer is tough to load under the 1,400lb TW limit on my 14,000/1,400 lb WD hitch. A better choice would be a 16,000/1,600 lb version. Even better would be something in the 18,000/1,800 lb range.
Another challenge is this trailer comes from the factory about 500 lbs heavier on the kitchen side vs the camp side. Since there is a lot of storage on the kitchen side, it’s hard to load it without making it more lopsided.
Finally, total trailer GVW is very easy to exceed. Especially if you carry more than just emergency water in the FW tank.
I strongly suggest a few visits to your local CAT scale to get it set up the way you want.
This thread might be useful …
https://www.mygrandrv.com/forum/showthread.php/49715-315-RLTS-Weight-Issues