Gents...I've read several threads regarding 150s and 5r's and I pretty much understand the weight issues associated and appreciate the information you're passing. My question is this...is it possible to increase the cargo capacity by adding a leaf spring or inflatable leveling devices to keep the truck from squatting under the weight and still be legal? I'm pulling a 1/2 ton rated 5th wheel (6500 dry). No prob with towing, but the pin weight is the issue. I've installed heavier load tires and it doesn't bottom out the suspension, so I was wondering if I could somehow increase the load capacity with an after-market solution...thanks!

 

Nothing you modify is going to make your trucks GVWR change. You must stay under that weight for the truck. A 6500 lb dry trailer loaded is probably 7500 lbs loaded. 20-25% pin weight is 1500-1900 lbs. Unless you have the HD package your truck has a 7200 lbs GVWR. You will be over your GVWR as soon as you drop the trailer on to it. Add hitch and passengers, you will be way over.

I pull a 5th wheel with mine, so I am not trying to bash you here. My trailer weighs 3900 lbs dry and has a GVWR of 4800 lbs. That is about max for the f150's and still being able to add passengers and gear. Stick around 5-6000 lbs GVWR on 5th wheel, not dry weight, and you should be OK.

 

I think the Tracker man is dead on, good advice.

 

The Tow rating and GVWR is a limit of a combinatiion of things: Srpings, brakes, differential, bushings, frame, engine, transmission, shocks, etc. Increasing capacity of one does not increase tow capacity.