Thank you #toyodaaddict for your thoughts.No. Original Equipment from Manufacture. Sorry bout that.
Referring to the second and third questions:
Given the intended use, "part time DD that will pull an overlanding trailer from time to time and do some mild wheeling" and "30” tires though the suspension will be designed for 33” tires" I would prefer to have a slightly higher stance in the rear of the truck, level would be fine as well but not a sagging rear. I thought the 63" Chevy springs would lift the rear higher than the RUF thus I was curious if I should purchase new rear, lifted springs to use in the front of the truck. However reading that the RUF are soft with stock weight, I feel there would be a safety concern at highway speeds pulling a trailer and the additional weight of the V6. Now I'm leaning towards a minimal lift, stock length, HD spring for the front. Thank you for the reminder about the low profile front shackles. I had forgotten about those.
For your use and tire size, I would look into the springs old man emu offers, like this
https://lowrangeoffroad.com/toyota/4runner-pickup-hilux-1979-1995/suspension/leaf-springs/old-man-emu-front-leaf-spring-heavy-load-110-240lbs-2-lift-cs009fa.html. I have seen a couple of the guys here use them with good results.
