Here are some data from a gentleman who bought a Ford based Tiger in the last year:
The GVWR for my 2011 F350 Lariat extended cab is 11,000 lbs, the front GAWR is 5,200 lbs and the rear 7,000 lbs. For a Ford 350, the rear axle itself is rated at 7,280#'s, the spring pack is rated at 7,000#'s. The determining factor for the rear GAWR is the tires. According to Ford's specification, my LT275/70R 18E tires can support 3,640 lbs when inflated at 80 psi.
09/06/2011 at delivery: Front - 4,080, Rear - 5,600, Total 9,700 lbs
12/05/2011 fully loaded: Front - 4,540, Rear - 6,660, Total 11, 200 lbs
This past week I was at an Rally and had each wheel weighed fully loaded including gas, fresh water & LP. Here are the results
Right Front - 2,175 (passenger side)Total Front - 4,475 lbs
Left Front - 2,300 (driver side)
Total Rear - 6,780
Right Rear - 3,300
Left Rear - 3,480
Vehicle Total - 11,255 lbs
According to the December & April weights, I run 200 to 250 lbs over the GVWR. According to the April weight, I have 725 lbs to spare on the front GAWR, but only have 220 lbs remaining on the rear GAWR of 7,000 lbs. However, the 7,000 lb rating is due to the spring pack and, since I have SumoSprings, I think that I actually have more reserve in the rear.
Critical Issue - The critical issue is the Left Rear weight of 3,480 lbs on a tire rated at 3,640 lbs. That means I only have 160 pounds of reserve on the Left Rear. This reserve is comsumed whenever I fill-up the grey and black water tanks. Thirty gals of dirty water is about 250 pounds.
Understanding how much your Tiger weighs front and rear combined with the fact that the left side might be loaded more than the right is important when packing for that 4 week plus boon docking trip. Also knowing the load limit for your tires is very important.
Adding boxes or/and mounting motorcycles on the rear could easily bring you over the rated tire ratings and GAWR.
These data offered for your consideration with no guarantees.