Your going to use the truck to carry a TC in the bed which the trucks rear axle takes most if not all the load. Both trucks have the same 7050 RAWR that will carry the TC weight.
That 581 lbs is probably a gvwr based payload difference. Using the trucks 7050 RAWR between a std cab gas engine 4wd vs a crew cab gas engine 4wd shows around 250 lb difference. I would 'spect the Dmax/A would have about the same differences.
Some of the newer gen 350/3500 SRW trucks with those high 11500/12300 GVWR with 4000-4500 lb payload stickers will and have overloaded the truck 7000-7050 lb RAWR when its all used in the bed. Watch those TC numbers your settin' on the trucks rear axle.
