In a previous life, I picked up and delivered foodstuff. It wasn't unusual to have a trailer that had a funky smell to it. You never know what was in there before you got under it.
A funky smell in your trailer will get an outbound load declined.
If the situtation was such that it was impractical to get another trailer, it was fairly common to spend 5 bucks on a pound of cheap coffee grounds, scatter them around the floor a bit, and sweep them out when you arrived at the shippers whse.
It worked every time.
There isn't too many things that smell better than fresh coffee.