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wuli959's avatar
wuli959
Explorer
Jul 11, 2016

Questions: 2015 F250 Capacity Enhancements.

This forum is amazing in the information that is shared. Thanks to all to that take the time to educate those of us that are just starting out.

I apologize in advance for another rookie suspension/capacity question. I've been following truck camper threads for many years while using a pop-up camper that I pulled with a Honda van. Never been able to make the jump to afford a TC/Truck combo. Bought a F150 several years ago and hoped to find a light weight camper (FWC) to use with it but my wife balked at the lack of amenities.

Jumping to today, I was able to find a 2013 Northern Lite TC where the seller was willing to pair up his 2015 F250 SRW truck and sell them together.

What I had hoped to do was also to be able to tow a 12' enclosed motorcycle trailer (dual wheels with electric brakes). Then I weighed it.

In it current form, the truck is more then maxed out even before I add a tow to it.

I understand that the increased capacity of an F350 is derived from the wheel/tire and perhaps springs. Same axle, frame etc are used in both the 250 & 350. (Is this right?)
For the 2015 model year, the same truck configuration in a F350 with "18 inch All terrain tires/wheels" is rated to max GVWR of 11,300 lbs. 4800/7000.
(I've read about the 19.5" wheel/tire combos but I hope to use the TC in rough road/beach access situations)

I realize that this would still be above the truck's GVWR but would like to add a safety factor of capacity to the vehicle.

If this would work? Where can I find out what wheel/tire combinations will work to enhance capacity and where to buy? Most of the wheel selling sites do not list load ratings and I've read about the poor quality wheels enough to be very cautious.

If the tire wheel combination upgrade is made; what if anything should be done to the springs to assist? (Truck currently has air lift airbags).


Vehicle Details:

2015 Ford F-250 XL 4x4 Crew Cab 6.2L Gas 156" Wheelbase
10,000 GVWR. Front 4800. Rear 6290.
Tires: 17" Michelin LT245 75R17. Rating 3195.
Wheels: Stock Ford 17x17.5 wheels. Rating unknown to me
(Ford C34-1015 BA BLK JA SL F2647 Mexico F2 2014 03 03 T 00T. 17x7 1/2J 40 INSET EN8SA) .
Bilstein 5100 series Front and Rear Shocks
Hellwig 7271 Big Wig rear sway bar
Air Lift airbags installed with separate fill valves (80 psi)

Camper: 2013 Northern Lite 8'11" Sportsman

Weighed the truck & driver with full tank of fuel (35 gallons) = 7260 lbs. 4160 lbs Front 3100 Rear

Weighed truck & driver/passenger/dog with "loaded" camper with full water tank = 10,600 lbs. 4240 Front 6360 Rear

This would show that I am over the truck GVWR by 600 lbs and assuming that the rear axle wheel/tire combination actually provides for 6390, I am over by 100 lbs already of the truck's stated axle but close to the wheel/tire combination.

Thanks for your input.

David Anderson
Louisville, KY
  • Get a set of 18" new take-offs from dealer and you will have 7000+ lbs capacity. It should be around $500 for a set of four tires and rims.
  • Thanks for the comments.
    To answer a few questions and make a couple of comments:

    The truck loaded with gear/water/food and a full tank of fuel is at just under 6400 lbs on the rear axle.
    Truck has a Hell Wig Big Wig rear anti sway bar installed already.
    Bilstein 5100 shocks are "wrong". Do I need to replace with 4600's?? OR am I ok as is?
    Haven't weighed the tongue weight of the trailer I want to tow. I would guess around 200 - 250 lbs.
    My local Ford dealer and tire retailers are clueless when I explain what I'm trying to get done.
    I assume that I have to replace my current 17x7.5" wheels to use a higher rated tire, right?
    Is a 3750 rated tire about the limit for an 18" rim or are there higher rated options?
    Can anyone please recommend a tire/wheel combination that will work?

    Thanks for your advice.

    David Anderson
    Louisville, KY
  • You have the wrong Bilstein shocks. The 5100 are their off road shock. The 4600's are the heavy load shocks.

    As the others have stated, you actually have more capacity if you upgrade a few things.

    What is the hitch weight of the trailer?
  • If when loaded with fuel water and supplies you are approaching 7000 lbs on the rear axle, it's time to consider going to 19.5" tires and rims. If you are around 6500 lbs, there are plenty of 18" wheel combinations that will still allow you to tow.

    If the the truck has the upper overload spring, you should just need the upper and lower StableLoads to carry 7000 lbs on the rear axle. If you don't have this upper overload, you probably also do not have the rear stabilizer bar - These will be the first things you want add before making further changes.
  • Just realized my sig did not show...my set up is a 2014 Lance 1050S and the truck is an 08 F250 crew cab...
  • See my rig set up in signature...I have thousands of miles on this set up and no issues. The biggest thing is road awareness, in my opinion. I don't do over 60-65 mph, allow extra stopping distance. Always be aware of what's around you. No matter what you end up with, it is a lot of weight going down the road.As has already been noted....proper tires are extremely important (as is proper inflation).
    MOST OF ALL: HAVE FUN!!!
  • What Socaldesertrider said is what I would do and what I did for my camper, except for the wheels.

    That would depend on what size tire you went to. 285/75Rxx will get you up to 7500 rear axle weight. I'm running this tire on OEM rims which are a bit narrow.(Firestone suggests 7.5 to 9.0) This will shorten the wear life of the tire, which in my case I am accepting. Hopefully I'll get 30K. Currently have about 10K and they still look good.
  • That axle will hold 10k, your not over axle capacity but as you have alluded, your over the wheels/tires for sure. There is no real place to find posted wheel capacities, however most if not all have the limits stamped/cast into the wheel.

    Just for example, I carry 8200+ lbs on my rear axle when towing with my setup. The axle is rated for almost 11k from the manufacturer and my needs were addressed according, suspension got some help, had to go to 19.5's but I got some of the most aggressive ones I could. I also go offroad but know my trucks ablitites and limits. If I'm that heavy loaded, I just don't go where I'd need to air down. You really can't have both ways unless you go for a lighter TC or deal with the weight and limit your offroad to logging roads and the such.

    I'd also be wary of that truck if it doesn't have 4.30 gears and you plan to tow and hit mountians, it will be slow!!!

    That truck is the same as a F350, add some better tires/wheels and you'll be good. I would evaluate your wants and then consider weight adds up QUICK...don't shell out a bunch of cash and then find after you add the trailer and other stuff your over tire weight again...my tires will hold more than my wheels, those are my limiting factor at 9k lbs...

    Donlt rush, this may not be the deal you seek or it might, go in with both eyes open and know....if your not comfortable going over the GVWR and want squishy offroad capabilites, you won't ever be happy with that setup.
  • GVWR is "paper" rating generated for tax/legal purpose.
    What you really need to observe is tire max load.
    You are already 100 lb over rear axle capacity before you load food and booze, while you have spare capacity on front axle.
    To balance it right, you might move spare wheel to front bumper.
    Not cosmetic move, but works great.
    Still you are on thin line with adding weight to the combo.