I'm asking this for a friend cause I sure don't know.  He is wanting a average family sized pontoon.  He has a v6 Highlander suv.  Is a pontoon to much to handle?

I think it'll be ok, as long as it's not super windy. They have a tendency to wander a bit in a cross wind since it's pretty much a sail. Overall weight wise they aren't super heavy so it should be ok for pulling.