hi cranky!!! you can buy rear uprights that are toed in already, i think tamiya has 2 degree toe in rear uprights for tt-01 there are lots third party manufacturer that offers the same feature, anyway for you to be able to measure toe in and out, we use set up tools they look like complicated rulers.hehe if you want to go using a practical route you can use a4 sized paper, draw 2 ninety degree lines that are parallel to the wheels, and use a protractor to measure to measure toe,,

Clangeddin to lower down the ride height without purchasing new shock absorbers just remove the spacers and thats a few mm off right there.

Cheers!!!