We have a 2019 Solitude S Class 3350RL. Discovered birds had nested in the empty space above the king pin, and while removing said bird nest, found the inside of the box to be very rusted. I no longer trust its strength potential because of the amount of rust. Wondering if an upgrade is worth the cost, or replacing the Lippert pin box is sufficient. We generally pull the rig 3 or 4 times a season, but I want nothing on the rig to give second doubts about safety. I am going to make removable aluminum panels to block off all access to critters in the future, which ever pin box we decide on. All advice welcome, thanks.