So, the install went smooth. Took me just over an hour and I only needed assistance once: to get the 2nd spring in place I needed ballast wearing a size 13 boot to step on the hub so I could squeeze the spring into place.

Thanks
@71-CRUISER
I had forgotten that I put 1" spacers on top of the OMEs once I got my trailer. It helped get the tongue and hitch lined up better at the time.
Measured each wheel before:
Driver side - 17" - top of rim to top of fender
Pass side - 17.25 - top of rim to top of fender
Can you say "Cruiser lean"?
With new springs - ICON Vechicle Dynamics Overland 3" dual rate springs
Driver side - 17.5" - top of rim to top of fender
Pass side - 17.75" - top of rim to top of fender
Net gain of precisely 1/2" on both sides, which is about what I was hoping for - nothing drastic and I won't have to readjust the front coilovers. There is just the slightest amount of rake, but it will hopefully ride flat when I'm loaded for bear and hauling the trailer.
While I had it on jack stands I let the axle drop completely under its own weight. . . and measured the shock eyelet to shock mount distance. I don't think the ICON VS shocks have that much more length, but I was curious to see the difference anyway. These shocks are about 2" longer in travel than the stock Toyota shocks.