Hi New here also and do own a 26RR. ( svworthington )Don't get persuaded to buy anything from the dealer. Time, take your time and get things as you need them. The only thing I purchased (not at the dealer) was a Weight Distribution With Sway Control. I have a 3/4 ton Chevy 4x4 and with that said, It pulls way better than without. Other than that, get the normal things like waste water hose, clear water hoses, wheel chocks etc... things like that. There are many things you will need but take your time. I am not new to the camping scene but am new at owning my own.
The trailer is pulled up north and stays for 6 months and then stored inside a pole barn during the winter months. I have a Polaris 800 that goes up there as well as my brothers Can-am 800. Yes, they both get stuffed inside and I was impressed when I got them in there.
So, I have to take my time at purchasing things as well. Right now I am looking for a rear screen for the Ramp door. Just haven't found the right one just yet.. Good luck and congrats on your purchase as well!