Thanks everyone for your wishes and advice...
Our first trip was a success! Maryhill State Park, along the Columbia River in Washington. Beautiful site and park.
Amazingly, the kids kept to their sleep schedules and the dog was a rockstar! I think having the trailer on our property for a few weeks before the trip was helpful. That way, the dog was used to the rig and felt at home before we even left.
Things we immediately learned were:
-where to park and where not to 'try' to park
-travel time is at least double for our family
-which types of turns are easy to make and which ones are a challenge
-certain cabinet locks need to be tightened or replaced
-we need to more info on un-winterizing the trailer (the water smelled strange? Due to being winterized? Need to do some research here.)
-it's worth having better plates instead of flimsy cheap plastic
-we need to adjust the fridge (it wasn't cold enough)
-don't forget to keep a broom in the trailer... oops!
-we also need to do research on care and maintenance of toilet system
-ask for help from other travelers. Most people are friendly and happy to help
I'm already researching spots to go for our next trip!