Help with payload numbers

See one of these threads every other day. You'll get reccomendations for duallies all day long and they're more stable but necessary is a matter of opinion.
Diesel doesn't hurt rear axle load. Engine is in front contrary to what the weight cops on here say.
You couldn't have picked a more capable truck. Have fun!

Given a RGAWR of 7050 lbs, you should be ok. I tow a 16K Bighorn loaded for full timing with a RAM 3500 SRW and have weighed it several times. I have the truck heavily loaded and 270 pounds of picture frame and manual slider.

The diesel will have a lower payload limit due to weight of the engine. Without going into a long dissertation, i think your in dually territory with your large family and trailer your looking at. Just my opinion. I think you may already know that. You seem to know the weights well. Go by the yellow door jamb sticker payload limit and subtract from there. Good luck. You're smart to ask here first. Hope all works out for you.

A 2017 GMC Sierra Denali Crew with 8 ft bed with Duramax has a payload of 3565.

As others mentioned check your door tag, the brochure might mention 4000lbs but is that equipped the same way as yours? add a diesel engine and the cargo capacity goes down.

That trailer dry weight does not include water, propane, battery's, factory options and any options you may add such as a/c, generator etc. And because the storage compartments of the rv are in the front most of the weight of your stuff goes on the truck. It's all math.

Look on the door jamb for the cargo rating sticker. Chances are it's not 4080 lbs. Then subtract your family's weight from that number. Now subtract the 5th hitch weight from that number. Now subtract the gear that you may put into the truck (Firewood, tools, etc).
Thats the weight you have left for the loaded pin of the 5th wheel. No one knows how much you'll load into the front of the 5th wheel so thats on you to figure out.

3400 pounds for pin, 150 for hitch, 500 for family, 500 for the upscale trim comes out to roughly 4550 pounds in a truck rated to haul 4000 pounds. Yea, I dont see any problems at all. :h

How big are you and kids? If I take my spouse, myself and 2 of 4 smallest kids, or two biggest as teens, I have 800-900 lbs of people, Add into that the 150 lbs of hitch, 3000 lbs of hw, plus other assorted odds and ends, I am over 4000 lbs of payload needed. I should also point out, I pulled a 6500-7000 lbs TT with my family of 6, 2 alaskan malamutes, rack, canoe etc, and was typically 200-800 over the manufacture gvwr, but below ALL axel limits, and most importantly, the registered gvw of the truck. with NO white knuckle driving experiences just driving...
BUT, with this said.....a dually may be the better option if you are going to put bikes in the forward part of the bed, maybe a generator etc. You could easily need upwards of 5000 lbs of payload.

Marty

You need to look at the payload sticker on your truck, rather than the brochure number.

Your truck will be borderline for payload, with loaded pin weight of that FW, and family/gear in the truck. Using Old-Biscuits example, you should be under RAWR/tire ratings (most important), towing that FW, especially if not loading it to full GVWR.

The scales will tell the final numbers, but unfortunately it is hard to know the FW loaded pin wt until after the purchase. JMO, but I think this FW will work for you, especially if not loaded to 15,500 GVWR.

Jerry