Re: Um, Yeah I'm pretty excited.
Helmets for the daughters for sure Don! I haven't towed my two kiddies yet, but I wouldn't want them to 1. Watch daddies chain break into his rear spokes, and throw me off the bike, and 2. Then I get to watch where they and the whole rig end up!
Also, if you've got the front cover for the trailer, keep it on always, as you never know what kind of debris or parts the bike may throw at them, even at 20mph.
My daddy-instinct 2 cents is all!
Have fun with your build!