Max traction setup for 2wd 4runner (sand)

Hi, I have a 2wd 4runner (stock) and am looking at my options. I'm looking for recommendations for a high traction/flotation setup to help me manage sand or silt. Up front, the 4runner fits 285/70r17.

I'm looking for beadlock style rear wheels and to maybe bring these as cargo to unload and bolt up while I'm off pavement. I may be able to mount a larger size tire in the rear and run staggered tire sizes while off pavement.

If I go with 285/70r17 I'll need 7.5"ish wheels. Does anyone know if Toyota sells a 17"x7.5" steel wheel in 6 bolt?

Should I prefer E load (over D load?) on the beadlocked tire? I want to air it down for flotation, is the E sidewall too heavy?