bigger the better
add fishing gear and gas and let say you went camping over the weekend and you put all the camping gear in the boat
6500K is pushing it
160 gallons of gas, at 8 lbs, is almost 1K, add almost 4K for boat and your at 5K
then the motor, say 6-7lbs, your at 5500
then add all you fishing weights, ice and gear, another 1k
go 7k