Sounds like you are well on your way to a terrific trip. Yes, with a Sag wagon you will be able to travel light. I use two bags for light travel the Zimbale 11 liter canvas Saddlebag and the Zimbale front Rack bag (fits on my nitto front rack)

I would add that having both a tail light and a headlight are a must. Even the best laid plans can sometimes catch you in the dark.

Crazy Guy on a Bike is perfect and of course Adventure Cycling. Looks like the links have been shared.

I also invite you to read Bike Touring News - this is the blog my husband and I have. We offer insights, suggestions and gear for all bike travelers. He just wrapped up a trip from Austin to New Orleans (also on Crazy Guy) but can be accessed from our site.

Me - I am on the road to recovery after 18 months of severe Achilles Tendonitis so feel like a newbie all over again

Happy Riding,
Sky King