I agree, I just did this about a month ago... you have to use a rear spreader.
From what I have read the traveling one you are looking at can be difficult to use.
Buy the other one for an additional $30, you will not regret it.
http://www.snydersantiqueauto.com/rear-spring-spreader
I bought mine from Synders and was impressed, if you are close to Cincinnati, you can borrow mine.