Agree with Charlie. The structural attachment of the coupler to the frame rails does not appear to be compromised, so you can tow it safely.
Do inspect the safety chain attachment, which looks like it might have sustained some damage. While you've got a welder working, consider moving the chain attachment to the sides. A single point attachment on the bottom is not best practice, though it is very common (including my Scamp). Here's a great article on the best ways to attach safety chains: https://mechanicalelements.com/how-t...safety-chains/
The rest is a matter of cleaning it up and preventing rust from getting a foothold. I'd take it to a small welding shop or one that specializes in utility trailers, not an RV shop.
On a scale of 1 to 10, this is maybe a 2 in terms of bad Mondays. Just enough pain that you'll not soon forget. Best wishes!