Most often only hanging weight is not permitted, but other forms of gaining weight is ok. I still pulled in a street class with some weight shuffled around.
With out any weight over the back wheels, I see you having a hard time moving the sled at all. These 1st gens are so dang light compared to the trucks produced today.
Just my 
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'02 F-250 regular cab, 4wd, 6 speed, stock, and staying that way.
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