Make sure you center the weight over the axle but slightly forward so you have decent tongue weight. Go watch YouTube videos on tongue weight demonstrations if this is your first trailering experience.
If you're going to do this frequently, I'd suggest adding Firestone airbag kit inside the rear coil springs. Backs of 4Runners are very softly sprung. I did this to my 2021 TRD after my experience with my 17' and 1000s of miles towing my off-road camp trailer. Kit you want Firestone W237604135 Coil-Rite Kit , BLUE https://smile.amazon.com/dp/B000JK0XKI/ref=cm_sw_r_apan_i_G8PF359HSA2Q8J75KN2V?_encoding=UTF8&psc=1
This is the one I bought for $95
Firestone W237604135 Coil-Rite Kit https://www.amazon.com/dp/B000JK0XKI/ref=cm_sw_r_cp_api_glt_fabc_XNFEGF8C09ZQ5ESZKEN9?_encoding=UTF8&psc=1
Yeah, adjustability is kindof a requirement; I don't want to raise my CG and compromise everyday handling. I've been looking at a coil-rite kit for the rears and something like this on the front struts, but I'm not sure those are the right parts.
The controls seem pretty straightforward if you don't need 'em to be nimble. One valve per corner that either connects or isolates it from a common manifold. And then the manifold gets a gauge, a vent-to-atmosphere valve (with needle orifice for speed control), and a compressor inlet probably also with a check valve. I could automate it, but for as often as I'd adjust it (once when approaching the trail, once when leaving it, once before a blizzard, once after the snow's gone), I'm not sure that's prudent -- I don't mind taking a minute per corner to dial it in.
Trouble is, it's my daily driver and I'm leery of adding complexity and points of failure that're outside my field of expertise.