Thanks for posting this. I've been meaning to get a pair as mine have been through a lot and they are starting to streak a bit, was going to do it at the mechanic but might buy online and give it a go myself.
Have you considered keeping the 18" wheels for everyday use and maybe getting a separate set of 17" for when you want to do more intense off-roading? Just a thought, might give you more flexibility.
Hey there! I'm pretty new to the tacoma world, but have you considered using a battery isolator? Heard they're pretty good for charging secondary batteries while driving.