Very stable while standing up and the anchor system very good. I should also add The river system I took the poontoon on was pretty extreme. I know I could of done much better in a raft though. The Pontoon just seemed to bounce off the rocks in shoots. (places where I needed alot of boat control.) I've seen a couple skoocums on roof racks and they ride just fine. I put mine in the back of my Tacoma with the top of the pontoons riding on the cab. Worked great.
I'll finish my replys tommorrow I just got a pretty good fishing reports. Its time for NATES ON A FLY!!! Doesn't get any better than that... Whish me luck. I only do it about 10 times a year now.
Peace and good luck on finding the right boat for you!!!!