I probably have one of the heavier deuce trucks on the site with 20K Garwood nested in front, V8 CAT, and mid mounted M977 crane. I've scaled the truck at 18,000lbs with 8 on the front and 10 on the rear. I changed front wheels and tires over to A3 wheels with 40" Conti's to up the front tire rating. Front springs are flat...maybe 1.5" from bump stops. Truck acts fine...just heavy. You really need to ask, how much am I really going to get in the bed of this bobbed 5 ton? If you're in love with the five ton spring idea, *maybe* you could get away with pulling a leave to lighten the rate of the spring pack. I know guys have done that on other vehicles with success.