Things happen and I'm sure at least this one "thing" you will not do again. We all have "things" happen to us too. In my case it was the dent in the side of the T310 the day I was bringing it home.
Now to the repair, here are some options.
The RV plug that was ground up, that is not a big deal. In fact I upgraded mine as the OEM ones are really hard to pull out of the shore line box some times. Camco makes what they call a Power grip plug See here for one place Amazon.com: Camco 55245 RV 30 Amp PowerGrip Replacement Plug: Automotive
Replacement Electric Cord Ends/ Plugs for your RV
The Power grip plug is really nice to use to plug and unplug with and not fear you are going to get your fingers where they should not be. The only down side I have found is the handle is a little large to not let the standard campground shore line box close all the way. Still works fine though. You can shop around and my find it maybe cheaper then the 1st place I found one for you. I bought mine on line somewhere a while ago. They are cheaper then they use to be.
Or you can buy an entire new cord set for $34 like is there now. Sigma Power Cord - Male/Stripped
That takes care of everything back to original.
The skinned wires is a concern and I cannot tell from your video if the power conductors are skinned. In the summer months where the AC is running you can use full current and if any of the copper strands are missing in your shore line cord that can be an issue. You mentioned taping it, again not being able to see what it is that will be taped I can't tell you if that is a good thing or not to do. The shore line cord lays on the ground in the wet and it needs to be a water tight cord.
Or if you like the Power grip feature, for $45 with can buy a 30 amp , 25 foot extension cord with the plug molded onto it and cut off the female end and have someone tie it into your converter. This gives you a new cord and new upgraded plug.
Camco RV 25' 30 Amp Extension Cord
Since the shore line cord was yanked, if you have a friend who is electrically friendly have them check the power converter that nothing was disturbed there. And if he or she is checking they can put the new cord on for you. Sunline has on both of my campers put a cable eyelet to pin the cable to the camper in the event the cord was ever yanked it would not pull on the converter. I would expect your camper to have that same feature. But still a check at the converter would be prudent.
Your bigger issue is the fender skirt... The type in your video looks like the same type that is on my camper. I myself have not yet found a replacement for that style, but I now have a possible maybe place to start.
Frank and Trailblazer here on SOC have been to these folks Bontragers Surplus Inc.
If you can take a picture of your style, measure it they may have one. If they have it, that will be the cheapest option I think.
These folks may have some things close. I have bought from these folks and a good company.
RV Exterior Parts - Fender Skirts - Tandem Fender Skirts - IconDirect
Or these guys, never bought from them.
Fender Skirts - Tandem Axle Plastic
This is a new find and actually found a 99 to 02 Sunline skirt...
. They may have the ability to create one. They have so many I do not know how they back into them.
RV Parts - Sierra Engineering Co., Inc - Product List
At the moment we do not have a good source for fender skirts that I know of. I know Sunline Fan has been working on trying to track down who Sunline bought a lot of these items from and do not know if he made it to the fender skirts. I myself will need some in the near future as I have cracks starting that I keep caulking up.
Hope this helps