Best place hands down is RChobbies in Covington. I90 then get on Hiway 18 and exit in covington.
Its not far off your path at all.
He has all the normal RCH chain store stuff and then one whole isle just for crawlers stuff. The owner and a few of the guys there are very into them and have many more custom stuff in stock than ANYONE else.
He stocks allot of stuff. I like that. Nothing more annoying than "I can order that for you"
I can do that myself for cheaper, duh! I want it NOW and in stock!