Just scored a set of Simex tyres today (Trademe)

35x10.5x16

Now need to get some rims to suit.
As they are 10.5" width tyres was thinking 7 inch to put pressure on the beads when aired down.
I currently run my 12.5" width KL71's on 8 inch rims and they work great for my truck.
What are your thoughts?
Note have searched the forum but info is a bit splattered about.