I found a good michelin tire that produces no hum, it's the LT275/65/20 Load range E LTX AT2's. But it is a pricey tire.

 

Going to a LT275/65/20 tire would not be a good idea for towing. That tire is 34.07" diameter compared to 31.90" diameter for your Pirelli 275/55/20 tires. That is a difference of 6.37%, which would effectively change your axle ratio from 3.73 to 3.51. Not good for towing. If you are set on getting LT tires, then a better choice would be LT285/55/20 which is 32.34" diameter which would change your axle ratio by only 1.37% to 3.68.

This does not change the fact that your OEM wheels are only rated to 2025 lbs or 4050 lbs for the pair. The higher load rated tires will not increase your capacity. A better idea would be to get after market 6 lug wheels with a higher capacity. There are many aftermarket wheels with 2500 lb ratings. Your OEM Pirelli's have a capacity of 2409 lbs each. Also, there are tires in your OE size that are XL load rated at 2833 lbs each.

That 5th wheel you are planning to tow has a dry hitch weight of 1280 lbs. Put your supplies in the trailer and the hitch weight will easily top 1500 lbs. On your Platinum your payload is probably only about 1400 lbs. What does the yellow door sticker on your truck say is the payload rating?

Some wheels for thought. Look through the specs.
http://mhtwheels.com/mht-luxury-alloy-wheels.cfm?id=628

 

I'm not saying the truck wont tow the trailer just fine but there is no way you will be well with in your trucks limits. Adding the updates you mentioned will help but i'm betting you will be atleast 400lbs over your trucks GVWR.
My trailer has a dry weight of 6500lbs and a dry hitch weight of 850lbs which is 420lbs less than your dry hitch weight. Also since mine is a bumper tow i have the advantage of using a weight distribution hitch which distributes weight to my front axle and some back to the trailer axles. You don't have that option with a fifth wheel not to mention the weight alone of the fifth wheel hitch itself! That is a whole lot of weight on your rear axle. Anyway i weighed my setup and with my truck also having a GVWR of 7700lbs I'm just under my limit at 7560lbs with the trailer hooked up. Now your talking about adding another 420lbs of "dry" hitch weight, plus the weight of the hitch itself, Plus whatever weight you will be adding filling it and getting it ready to camp. You unfortunately will be well over your trucks GVWR..

 

It really comes down to what trailer setup you have. My father's Jayco Eagle 322fks, has a front kitchen which puts his hitch weight around 1100lbs... and he's pulling it with a 08 Tundra crewmax and has no issues.

The fifth wheel we are looking at is one of several but they all range from 1100-1300lbs hitch weight. They are all safe to pull with a half ton vehicle. The ratings are based by federal law at 80% of what the truck can actually handle, this was done in part to the firestone fiasco years ago. Bottomline is the truck can handle the light fifth wheels just fine. Keep in mind we aren't pulling a 40ft fifth wheel, this is at max a 30ft fifth wheel with a max hitch weight of 1200-1300lbs, and a rear kitchen.

 

I understand what your saying but ignoring what the limits are on the vehicle will not be a good thing if something ever goes wrong on the road and you god forbid get into an accident. I will guarantee you that your insurance company will be the first to check and see if your within your legal weight limits. And unfortunately when they find out your not they will for sure deny any claim..
But like you said there are a ton of 5vers out there with much lighter pin weights that will work with your truck. Before buying our Outback i almost bought a Cougar 27SAB that was 30' long, 7000lbs dry and hitch weight was 1060lbs. But the Outback was a little lighter and had much more room inside so we decided to stick with a bumper pull and went with that. Good luck with your choice!

 

I will actually be swapping tires today for the 285/55/20 AT2's. After speaking with my dealer, the larger tires can cause shifting issues while under load.

Anyway project for this weekend will be bilstein HD shocks in the rear.

 

Is the dealer selling you the tires?
I have some experience with upgrading some of our f150 delivery
Trucks to 10 ply tires , and the TPMS system will need to be recalibrated to recognizes the higher pressures. Otherwise your TPMS light will come on/

Fords crapy TPMS systems doesnt tell you your tire pressures for each tire just the idiot light comes on. In this case it will be on for over inflation.

 

I got the tires from a reputable local tire dealer, so far I have no issues with the TPMS system.

I did take it in to see if they could reprogram the tire size originally, I'm not sure if they adjusted the TPMS while they were at it.

 

By your GVW sticker there is a yellow one with PAYLOAD rating what does it say?
I think you are very optimistic at 1900lbs!
I have a Lariat HD payload and its payload is 2003lbs.
Your Platinum will be much less

 

I plan to take the truck down to a scale to find out actual weight. Afterall GVWR is all that matters since I no longer have the stock tires. The yellow sticker on the door is useless since tires got switched as it is all based on a formula.

 

This may be a silly question but given the above, is the GAWR based on the tires/rims and not on the actual axle itself?

I just ordered a 2013 F-150 and didn't want the 8' bed so I couldn't get the HD Payload option (With the option combo I wanted I had to get an XLT and the HD Payload was only for 8' bed XLT trucks apparently). From reading all the messages about towing here and reviewing the Ford specs I thought that the GAWR for the rear axle on a non-HD model was 4050lbs and for the HD model it was 4800lbs.

I'm sure I read somewhere here that the wheels were rated for 2025lbs which I had assumed was a combination of the tire, the rim itself and the 6 vs. 7 lug setup.

I guess what I'm asking is, if I changed the tires to a higher weight rated tire and got whatever equivalent rims does that officially increase the GAWR?

Thanks in advance for clarifying.

 

I can only clarify the HD package and bed options. On the XLT, the HD package is available on the SuperCab in 8', or SuperCrew in 6 1/2' bed.

 

There is nothing you can do to change the OFFICIAL load rating.

 

Then the GVWR sticker would also be useless as it is also based in part on the wheels and tires. What are you trying to do?

 

The stock GVWR is what you have to legally go by since you cannot legally change ratings. So it's simple find a scale... get it weighed empty with a full tank of gas and subtract that minus your GVWR, what is left over is the actual payload.