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Can you physically tow the trailer? Yes
Should you? No
Will you be legal in the majority of circumstances depending on local laws? No
Agreed. Besides the legal issue (and being sued after an accident that maybe even somebody else caused is not fun), it won't be a good experience when you go significantly over one or more of the ratings. Going down a hill noticing that the trailer is about to pass you sucks.
Yes, you can go over the limits, it's done all the time. I would just not recommend it, it is not a good idea.
This, btw, is the main reason why I am switching to a F-150. Our 4,500 lbs trailer turned out to be too much for my Tacoma (rated at 6,500lbs) only because of the payload. An F-150 HD payload will be ideal for the job with around 400-500 lbs of margin, of which most will be needed for longer trips. Yes, I am sure we will get close to the payload limit (~2,000 lbs) of a 4x4 screw EB HD payload with a 4,500 lbs trailer. Weird, isn't it?
Setting aside My personal feelings about how the tow/payload capacities are rather arbitrary, I would recomend that one stays within the ratings spelled out for your specific combination.
The reason I say this is strictly from a legal stand point, should something happen, it would be "your fault" and it would be a very easy task for a sharp lawyer to prove it.
There was a couple pulling a boat home from the lake earlier this year and forgot to hook up the safety chains. The trailer came off the ball and went head-on into an oncoming car. People were killed in the accident and the driver of the truck pulling the boat was charged and convicted of Negligent homicide.
I could easily see a similar arguement being made in the case of a wreck. Hauling over the rated limit is "over loaded" and thus all fingers will be pointed your way if there were ever to be an incident.
Setting aside My personal feelings about how the tow/payload capacities are rather arbitrary, ...
You think so? I would imagine that there are quite a few calculations / computer simulations behind those numbers. If you know the strength of the individual components, the right software would be able to easily give payload ratings for a whole truck with some set safety margins, no?
I am not an expert on this I have to admit though ....
I don't believe it's a good idea to pull a 35' 5th wheel with that much weight, max tow or not, with an F150. Yes there are 5th wheel trailers that are more suited for 1/2 ton trucks, but not ones that will put too much payload weight in the bed. The height of the trailer alone would create so much wind drag on the truck that it would be much harder to handle. I wouldn't do it, just my 2 cents.
I think a lot of people think I am crazy with this post but I was looking to do a fifth wheel with my 09 150. I would be doing a super light trailer that weighs 9800 pounds dry. when loaded about 11,000. all of the driving would be done on for the most part very flat roads and no real hills. My biggest concern with doing it is that I have the 5.5 ft bed. The super glide hitch can take care of the turning, it is the wheelbase that I am more concerned about and the truck getting pushed around because the trailer is 35 ft long. Any feedback would be appreciated. Thanks.
If your truck has Max Towing of 17,100 GCVW and you keep your pin weight as low as possible (under GVRW, load all your stuff in the back of the 5th wheeler, not in the truck), air up your tires (trailer and truck), adjust your brakes accordingly and be sensable when towing you should have no problems.
This is my dads 5th wheeler and would be pushing it on my truck...max trailer weight 11,300 and pin at 2200+...he uses an 2008, 1 ton crew 8' cummins and hooks his 21' bass boat behind it...he gets about 14 mpg going to florida each winter...but then he drives like an old man too...