So I have a 2020 F-250 SD 4WD FX4 XLT CC SB with the 6.7PS, 3.55 e-locker, and the HCTP. (unrelated to this question but for more info, it has the 3" class V travel trailer hitch from factory rated at 21,200/2120)
It has the M275 rear axle and the 5 rear spring setup. It also has the factory Ford 5th wheel prep package.

The stickers:
GVWR - 10,800 (Tennessee rules)
Rear GAWR - 6,340
Front GAWR - 5,200
Factory cargo rating - 2,906
Factory calculated curb weight - 7,894

Actual curb weight with full fuel and no passengers (CAT Scale) - 7,780 total, 4,620 steer, 3,160 drive
Adjusted cargo rating based on real curb weight - 3,020

It is obvious that there is some significant derating going on here since the F-250 with the HCTP and the F-350 are basically the same truck when it comes to what matters towing a 5th wheel.

The Rear GAWR for the F-350 is 7,230 for the same axle and spring setup
The GVWR for the F-350 is 11,500 in the same configuration.

It appears that the limiter for rear GAWR the F-350 is the same as for the rear GAWR on the F-250 and that is the tire/wheel combo.
It appears that the limiter for the GVWR on the F-250 vs the F-350 is the artificial limit imposed by the 10,800 GVWR on my truck.
Using the non-derated numbers of the F-350, then my F-250's payload rating would be ~ 3,720.

Other notes:
Tennessee has a max GCWR of 26,000 the truck actual is 30,000
The max 5th wheel hitch capacity of the Ford 5th wheel prep package is 19,000

Now that you have all the numbers, can my truck safely tow a Grand Design Reflection 311BHS?
Brochure numbers:
UVW = 11,185
GWVR = 13,995
Pin weight = 2,197

 

You need to look into what your loaded pin weight will be. I’ve been looking at a GD 337rls (same frame as the 311) Which has an advertised pin weight 2080 and people are reporting actual pin weights anywhere from 2500 to 3500 lbs. I too have a F250 6.7 HCTP and I’m honestly not sure I would want to tow the 337 with anything but a DRW. The GD. fifth wheel trailers are a lot heavier loaded than I anticipated.

you are right about how derated your truck is. And it is basically an F350. Mines a 2017, and there were softer spring rates, but I’ve heard the 2020 and up F250s have the same springs as the F350s, making them identical other than the badges and door stickers.

And LOTS of people pull 303s, 311s & 337s with SRW F350s safely and with zero issues.

It really comes down to if you feel comfortable or not.

im sure some people are going to chime in and say the world will end and lawyers will demand the first born for the next 10 generations if you tow over what the sticker says and get into an accident, but you already know that your truck is much more capable than the sticker, so again it really boils down to what you are comfortable with and if you want to run the risk of getting nabbed by the weight police and them by chance looking at your door sticker.

 

I am guestimating ~2,750 at max gross, That is somewhat controllable depending on how they are loaded. We are not boondockers so likely we will never travel with the fresh tank loaded which really jacks up the pin weight. Doubt we will ever put over 2800lbs of necessities in there either.

 

You need to know your weights loaded up. My truck, with wife and dogs, full fuel and about 1/2 def, and incidentals is about 3525 lb. I don't have a GD, but my rv puts 2335 lb on the pin, for a total weight of 5860. That would leave 480 lb for your truck. It looks like, without knowing your actual loaded up numbers, you will go over the RAWR if the pin hits 3000 lb. Your legal GCWR will be 24795 for that combo. Fords GVWR for your truck, is not what the Feds enforce, it is axle ratings.

 

I was thinking the same thing, that the pin weights people were posting were pretty high, but something to remember is the basement where most of the storage is at is a lot closer to the pin than the trailer wheels. Most of the food is going to be right over the wheels, and the closets & under bed storage is mostly forward. So it’s going to be very challenging to distribute weight evenly and that’s why the pin weights jump up so fast.

I have not seen anyone weighing in with less than 500lbs of additional tongue weight, and the people who were the lowest had dry tanks.

This was shared on the GD forums. For the trailers we are looking at with the front slide bedroom, it’s recommended to use 3% in the adjusted pin weight drop down.

Estimating Tongue/Pin Weight from Dry Weights - TowingPlanner

 

5860 all on your rear axle??

 

Yes, that is right.

 

You should be fine using your truck to tow that rig. Yes, the numbers will be close if loaded up completely, but you'll be okay. Honestly, it is becoming to a point where there is no need for a 3/4 truck from any manufacturer. The 1/2 tons are "claimed" to have such high ratings, the 1-ton gives much more rated capacity than the 3/4 ton and costs minimally more, so the 3/4 tons are now in a narrow window for rated use. I should have considered a 1-ton when I purchased my truck, but it never crossed my mind at the time.

 

Probably okay. Maybe a set of helper bags to compensate for the softer rear springs would be a good upgrade. The rest of the truck is more than capable of moving that kind of weight but you may get more squat than you want. You could swap stiffer springs in but the idea is to only use the bags when loaded and enjoy the smoother ride quality when not loaded.

 

For reference. 2020 GD 303RLS with A/C upfront
CAT Scale numbers
Actual ready for a weekend trip = 11,240
PIN = 2,320

I think your Pin is low you'll be closer to 2,800 ready to go.
Now that you have all the numbers, can my truck safely tow a Grand Design Reflection 311BHS?
Brochure numbers:
UVW = 11,185
GWVR = 13,995
Pin weight = 2,197

 

The 2020 F-250 with the HCTP has the same springs as the F-350. Another thread even has pics of the part numbers off the bottom of the actual springs.

 

My numbers were based on empty weight which is what they put on the spec sheets. Yep, loaded it will likely be around 3000.

 

Wonder what the actual difference is between a 350 and a 250 with HCTP is then. Their product lineup is out of control lol.

 

I think mostly stickers and badges.

 

The biggest difference now between the 250 and 350 depends on the state you live in. Going to a 350 can drastically make a difference in the cost of the registration and wether or not it needs to be smog checked. Here in Sumner county, Tn. a 250 will require annual smog testing where a 350 does not. In Ca. the tags between the two can be large. Also in Ca. a class C license is good for 15,000 lbs. tow weight but over 10,000 you need a class A non-commercial endorsement on your license. The Ca. drivers book is deceiving. I had to point this out to the lady at the DMV. She had no clue but I'm sure that a CHIPPY would know about it if you were in a wreck.