Australia. Sparesbox carries King Springs lift springs but I’ve yet to find an American importer
Shop For King Springs Coil Springs Raised Front KTFR-111 at Sparesbox Australia. FREE shipping Australia wide on orders over $99.
www.sparesbox.com.au
https://www.sparesbox.com.au/part/king-springs-coil-springs-raised-rear-ktrr-112
I disagree with the notion that the highlander can’t be a capable off-roader, I’ve seen RAV-4s Subaru Foresters and Honda CR-Vs take on pretty tough trails and they are all unibody cars, it just takes more effort and awareness when doing so.
You may just want spacers on your shocks, Hema4x4 and Northwoods Performance both make spacers which give you some lift, without changing springs.
If you are going to take it off road, watch your CV joints, as they’ll see some stress, but you’ll be alright
Queensland Bull Bars makes a steel front bumper, but in Australia the Highlander is called a Kluger.
good luck