Uging 3x3 for s-10 Stock Floors?

there is another program called struc-calc that will calculate steel, wood, g.l.b., joists, etc. i use it for work to calculate beam sizes, drag trusses, and floor systems for houses and what not. but you can use the program as long as you know what the tributary dimensions are and why type of loading the frame will be carrying (approx). it will give you the percentage of adequacy, uplift (if any, break it down into point loads ie: how much force is applied to the frame at each cab mount ect.