We've had our AR-One 15rb for about 3 years, and love it. I went to a WD Hitch, only because I was nervous about too much tongue weight on the Tahoe. The trailer has the strangest weight distribution, like a wheel barrow; With water, battery, bedding, food, our tongue weight was about 650 lbs. If you stand back and squint at the trailer, you'll realize ALL the heavy stuff is in front of the axle, and really no way to balance it out... hence my much beefier WD hitch for peace of mind.
Other stuff, I had the axle flipped to give greater ground clearance. Added a strip of LEDs as a porch light up under the awning. Put in a small medicine cab in the bathroom (where that stuck on mirror was.) Added a storage box to the tongue. Installed another storage hatch on the side for better access under the dinette seat.
OEM Chinese tires are marginal at best, so start considering going to 14" LT tires (like Yokohama Y356). ALWAYS keep the tire pressure correct!
My only final word of advise would be to never leave your awning open all night, or when a storm is approaching you. It will lift up and destroy stuff. Don't ask me how I learnt that!
Also, check out the AR-ONE forum for owners. We're there too. Have fun!