6 of one, half-dozen of the other. But I like Herk's comment. Nice and simple.
At the end of the day, once hooked up and running, you should not exceed any of the GAWRs, GVWRs, nor GCVWR. Where you count hitch weight in the unhitched condition isn't as important, since that weight will be shared across multiple axles once the WDH is engaged.
thebrakeman ('70), DW ('71), DD ('99), DD ('01), DD ('05)
2004 Surveyor SV261T (UltraLite Bunkhouse Hybrid)
2006 Mercury Mountaineer V8 AWD Premier
Equal-i-zer WDH (10k), Prodigy Brake Controller