raised flr/notches in burbs ??

[87 dually burb]

how much are most people raising the rear floor
how much notch is needed to clear 20's

I'm hoping to only have to raise the floor 3-4 inches and build the seat bottom on the raised floor and use the top 1/2 of the old seat

if my layout works right hoping to do the dually in feb and the 91 in the summer

[N2TRUX]

Anyone?

[RunninLo]

it really will depend on how you build your rear set-up. I went with a "bought" set-up that while being totally kick-@$$ raises the top of the notch 12" inches above the top of the stock frame. The quote from the supplier was "kiss your back seat good-bye". Of course he was refering the stock seat and my plans are similar to yours including trying to incorporate some sort of back seat into the notch cover. . I'll have more info to offer once I get the body back on, hopefully sooner than later.
I see that you're doing squares and mine is a '72 but I think the general process is similar.
I'm also trying to get my square dually on the ground some time soon so keep an eye for that too.

Josh