35" Mud grapplers to 40" Toyo Open's M/T

[accely]

hey everyone, it's getting harder and harder to resist getting a lift kit and getting 40" toyo open country m/t tires (so far they look the best to me at this size) SO....

Right now I have 35x12.50 mud grapplers on 20" rockstars, I love this setup but bigger IS better These tires and rims are only about 6 months old with maybe 3k miles.

Main questions and advice I'm seeking:

1. Will the 40" toyo's fit on my current rockstars? I was looking at Toyo's website and it looks like will, but it's not the "recommended" size match up.

2. What kind of lift kit should I get ? 2/4/6 inch? Brand? My H2 is 2005 with air ride.

Thanks a ton guys!

Current pic: