Yea, yea John...I got me a new toy!
Just as a follow up, I found that the 54970 hitch bar still works for the 3/4 Suburban, in just a different config than was the case with the Impala SS.
I did notice however, that the weight bars do not appear to be half as hard to take on or off with the truck, which was not the case with the Impala SS. I would have to jack up the connection to take them off or put them on.
Now, if I jack up the connection with the truck, I find I can actually snap the bars on by hand. Of course when I lower it back down I can't do it by hand, but either way with the Impala, I'd need the bar to put on and take off.
Additionally, I measured the amount of travel on the rear of the truck when I placed the raw hitch weight on the Suburban. It dipped only 2 inches. What's more, when I placed the bars on, I only needed 2 links and if I went 3 the coach would be slightly high.
Maybe a longer hitch bar with a lower ball might produce a better bar tension?
Any thoughts or comments?