If I'm understanding you correctly, The items you mentioned contribute to GVW and Rear Axle weight so you can be sure not to exceed the max ratings for each. Hitch load is the weight added at the hitch ball by a trailer. So if you are not pulling a trailer, that weight control attribute is not appropriate. The more weight added behind the rear axle effects the front axle by unloading it. That is why most of us like as much caster as allowed ie adjust to the high end of the specification range.
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