Those 3-1/2 inch-tall,wooden cross-members will be eliminated, since you're planning on a newer style bed,right? If you move your front axle to the top of the springs,I'd think that you'd lose quite a bit of your steering radius,due to tires rubbing either the frame or fenders. The smaller the tires that you use,the lesser your G.V.W. (SAFE) rating. If You decide to lower your truck,the most inexpensive way to do it,would be to go to low-profile wheels/tires,compatible to your 6-bolt wheels. Personally,I don't like the looks,especially on an older,(1-1/2-2-ton),truck. To me,it looks like a big truck,grafted to a 1-ton frame. Fuel mileage will suffer,as well. My advice would be to find a used "Jerr-Dan",or similar unit. They're usually aluminum,(lighter weight,more hauling capacity),and hug the frame nicely.this would MAYBE shave 4" from the height of your floor,the way it's set-up now.(Lower center of gravity,better stability). I wouldn't try removing any springs,since you're hauling some considerable weight. Make sure that your brakes are up to the task,as well.
