3/16" is ok or bias tires, but a bit much for radials. We do our own front end work on my fleet of trucks and I have turn tables. But many years ago I put a little grease on some tin and it worked quite well. After you get through setting the toe in, jack the front end up to where both tires are off the ground and let it back down. Measure your toe in again to see that you are still where you want it.