Check that the weatherstripping gaskets on the "A" sections and their mating counterparts on the roof sections actually meet. On mine, one set of them had about a half-inch gap when the camper was set up. Pointed it out and the dealer's shop fixed it in minutes.
Take a good bright flashlight with you to help your inspection.
Look underneath at the wiring and piping. Often the brake wires that run between the two wheels are held to the axle with zip ties or tape, but it needs more of them to keep the wires from drooping below the axle and possibly catching on something. Look to see that every wire and pipe that penetrates the bottom is well sealed and see that where they pass through the frame openings they're cushioned so they won't rub and wear through. They were ok on mine, but the pace of work at RV factories may mean not everything got sealed.
Inspect the sealing around all windows and all exterior joints, especially on the roof. Look for possible minor cracks at the corners of the bubble windows. One or two members have reported them and the dealers replaced them.
Look for weather-related cracks on the tires. My dealer said they've had new trailers come off the truck with flat tires (different brand camper, but Chinese tires are an RV industry-wide problem, IMO). On the positive side, we've pulled ours over 7,000 miles so far with no problems.
Have them show you where the water filter is, and be sure the plastic filter wrench and filter element are included with the packet of stuff you get.
We ordered three more of the cargo net pieces that are installed on the A walls. If you think you'd like more than the two that come with it, it's a good time to order them.
It's never too late to have a happy childhood!
Lee, WU0V, and Courtenay, N0ZDT
2011 Rockwood A128
2000 Silverado 1500 pickup
60W solar system
2000W inverter generator