pontoon damage

We had a pop noise when loading the boat onto the trailer. Inspected pontoons and no noticeable exterior damage. There is a clanging when docked from pontoon. Is this a loose baffle in the pontoon? How dangerous is this?

My new Bennington 22SLX has been delivered and is on my boat lift. My pier Shop...who maintains and installs my piers and lift each year is very respected on my lake and has I would guess maybe 1000 customers {thus lot of experience}, has indicated that although Bennington builds a good boat...