I've done that with rebuilt engines. I had an 86 Grand National and that was the procedure. Did that on my 78 Trans Am.
I've bought several new Toyotas over the last 15 years and the dealer never scheduled my first service at 1k to change the "break in oil". Does Toyota usual a different...
I asked my dealer if I need to do it a 5K for the first oil change. He said oil change intervals are 10k. Is the something I missed in the owner's manual about the 1k break in oil change or did you just do this as a precaution?
I'd seriously think about getting another set of the Falken Wildpeak's you already have or if you want a different brand the Mickey Thompson Baja Boss are wicked good tires. I've never had good luck with any BFGs. They don't hold air and dry rot in the Texas heat.
If it's factory and it looks like it has the factory Fox Shocks it's 2.5" . The additional height you may notice is from the 32" Goodyear Territory tires. They will raise the truck height as well.