superior waste on Cambridge street is likely your best bet. You can drive there, they weigh your car or truck and charge you per lb for dumping plus an extra charge for mattress etc.

https://nhoilundercoating.com/ this is the product I use on my rust prone Toyota. There are some local shops that apply it or you can get the sprayer and do it yourself. Definitely get something on it. Heard of lots of nice southern trucks seriously damaged after only a couple years of winters here