I have three comments that may or may not be helpful...
First measuring the ride height from the lights / body parts etc is kind of OK if you are looking for a rough estimate. If you want to check it "properly" the procedure in the FSM should be adopted.
See this post if you want to know a little bit more. I guess a dealer should / would have the special tools to do this:-
http://www.peachparts.com/shopforum/showpost.php?p=2539503&postcount=4
The guide rod? Uhmmm I assume they are talking about the brake support <= this is the FSM's description but there are a few others...
Adjusting the brake support will also ever so slightly alter the camber. It predominantly changes the caster - but the camber gets altered too.
When measuring toe in/out they are meant to use a spreader bar. If the toe is not set at zero degrees, then the other measurements / settings are not going to be spot on. The FSM specifies values of caster and camber at zero degree toe...
...I'm sorry to sound pedantic and to quote and quote the FSM but this sort of information may help you decide whether you are getting your money's worth.
Good luck.