66 C10 long bed 18" American Racing Wheels

[Nils]

Hello,
I have a 1966 C10 Long Bed Fleedside with the original 6 Lug Steel Wheels and 235/75 15 Tires. I have 4 Drum Brakes. Now I would like to change the Wheels.
The VN507 Rodder from American Racing in 8x18 and 4.5" Backspace are my favorite.
My plan is to use some Wheel Spacers / adapters (2") and Change the Wheels pattern from 6x5.5 to 5x4.75. The original steel Wheels have 3.5" Backspace. With the Spacers I have 5.5". The Tires a prefer are 235/45 R18 in the front and 275/45 R18 in the rear.
What are you thinking about my plan ? Have somebody do this before?

Thank you all verry much.

Greetings from Germany.

Nils