I’ve driven bush/mountain for over 30 years. You want something that’s going to get you in & out, Hence the 8-10 ply is an Absolute must. The prices for the 20” tires are still very high due a relatively new size. As well, they all have to beef up their casings to prevent cupping/premature wear...
I use Feit Electric LED lites, 250,500,1000 lumens. Old flash lite style, space age illumination. You can slide the ends from pin point to flood lite. The identification of objects at great distances is easy with these lites. Many companies have variations. The higher the lumens, the better...