Kyle's right about the water in those older sections. Years back a neighbor of mine pulled a few out near Higden and we figured they weighed twice what they should. The foam had taken on water and nobody had noticed till they were out on the bank. Two people minimum, and I'd add good boots, because that bank gets slick as glass.
Harrisa, $60 for a set of pontoon covers sounds fair to me. If anyone's looking, I'd tug on the seams before handing over cash. I've done a fair amount of sewing and repair on boat canvas, and the thread goes from the sun long before the vinyl does. If the stitching holds when you pull on it, you're fine. If it's chalky or comes apart, you can restitch with UV-rated bonded thread for a few dollars. Fade on the sun side is just looks.
Good luck with the sale of the house. Lake living is hard to leave.