wheel question

I'm finally going to buy some wheels for my new truck. Triing to figure out the backspacing for 18" wheels with a 4/5 drop on it now. I will have to be able to tuck under fenders because air bags are coming this summer. Any body have any ideas. Also parts for sale for a 98 ranger and also 05 ranger stx.

well my 18's and 20's are bothe 8.5" wide and are a +38 offset and tuck good. and i put them on my daily which has a 4/5 djm drop and the fit nice as hell. hope it helps. and do you have a bed for sale?