Okay, you asked for it.
A one ton stud it 3. 125 inches long. This measurement is from the face of the stud where it meets the inside of the axle flange to the tip of the stud.
Now the stud must go through the axle flange, the brake drum, and the inner wheel. This stackup is approximately . 75 inches thick. That leaves the stud extending 2. 375 inches beyond the inner wheel.
I have to add one note here. This is based on the assumption that your are going to use a stock steel inner wheel. To my knowledge, every manufacturer of aftermarket aluminum wheels warns against running anything other than the stock steel wheel in the inner wheel position. This is due to the wheels on all second/third generation Dodges being hub centric (located) verse lug centric (located).
Now back to the original issue. If the stud is extending 2. 375 inches beyond the inner wheel, and you add a spacer that is 1. 25 inches thick, the stud will still extend 1. 125 inches beyond the spacer. If the stud extends beyond the face of the spacer that the outer wheel needs to mount against, the wheel will hit the studs before it seats against the surface of the spacer.
There are a couple methods to address this problem. One is to machine additions holes in the wheel to clear the studs. Not what I wanted to do in my situation. I chose to remove the one ton studs and replace them with 3/4 ton studs. Unfortunately I do not have any extra 3/4 ton studs to measure from, but I know they were the right length to allow me to install the spacer and not have any interference with the outside wheels.
Sorry for this being so long, and I hope it helps.