OK. I read the primer that APT referenced and things make a lot more sense now. I always thought a WDH took tongue weight and put it on the TV front axle and TT axles. I see now that it is actually taking load off the TV rear axle and placing that load on the TV front axle and on the TT axles. Tongue weight doesn't change but rear axle load does. The airbags do nothing to transfer weight but simply raise the body higher off the rear axle but do not vary the rear axle loading.
Having said all that, the GCVWR of the Armada is 15,100. However, the GVWR of the Armada is 7150 and the GVWR of the TT is 6500 for a total combined weight of 13,650 to be distributed over the total of all four axles. The load carrying capacity of the Armada is 1488 and on and on with various weights and capacities.
At any rate, I think the light bulb (small as it may be) has clicked in my head and I'm sure I can do the math to make sure I don't overload a vehicle/axle/tire/combo. I believe a WDH is in my future.
How do I go about picking one? Do they come in different sizes/ratings? Are some easier to manage than others? As far as setting it up I guess I will probably simply pull the fuse (there has to be one somewhere) to the rear airbags until I get the bars adjusted. Any other suggestions are welcome.
Maybe I'll just go back to my Monaco DP motorhome. I'm getting a headache from all this thinking.