What backspacing I need for Waggy44 & Scout II

Like it says,
Front 86 Waggy D44 with 2" spacers (for bolt pattern change)

Rear Scout II 44 with 1.5" spacers

O'yeah they willl be black steelies 15" runnin 36X12.5 TSL's
Just want to know what the most I could fit before I buy em.

i run 3.75" on my scout 44 w/ 1.25" spacers and they fit pretty damn good. dont know the overall width your looking to achieve. i got my wheels from summit. i think they were 35 and change shipped each.

Hunter

15x8 with 2.5 backspacing, less than $40 each at 4 wheel parts