How to remove/replace bolt

Yes, you will need a drill bit for drilling metal and make it a good quality one. Buy a 1/8-inch bit and a self-tapping screw appropriate for the hole (drill) size. The hardware store clerk should be able to help you choose a good drill bit, properly sized screw, and center punch (if you don't have one).

If you doubt your current drill can do the job, buy a good quality cordless drill. You will need it again if you continue to RV.

(You will be drilling from the bottom up.)

Start by using the center punch to mark the place next to the existing mounting point where you are going to drill. Hit the center punch firmly once or twice with a hammer after cutting a small circle out of the coroplast (so you can see the "dimple" made by the center punch). The "dimple" produced by the center punch will keep the drill bit from wandering around when you first start drilling. Drill a hole and attach the bracket with the self-tapping screw.

Good luck!

Assuming you're not a newly wed and have some disposable income, try using the tool you have drill a hole next to the nail and put a screw and nut in place. Don't mess with the old one, leave it there. Just remember in the RV world, things brake more often than in the S&B world and eventually you will need to make more repairs.

My Thought For The Day

I'm 79 years old and yes I have accumulated stuff over the years, including the practice of buying better tools and making repairs that last. I still have a set of box end wrenches my DW bought for me about two years after we married. We were poor at that time, entry level job and educated at sea, no college. She Bought a Good set of wrenches and I still have them. I no longer rebuild an engine or do heavy work but I still try and repair what I can. I have now started passing these tools on to the maintenance guy at a BSA Camp, my grandson, and granddaughter's husband. Like marriage, good choices last a long time.

It's a good time to test yourself: how perfect do you want the trailer to stay, how hard are you willing to work/ how much are you willing to pay to keep it that way, how much can you appreciate how these are built and yet still go down the road for decades (vs so many cheap cars that die in a few years), how much advice to take in lol, etc.
I've learned a lot about myself, and DW, in the last few years- and how resourceful this forum is.

If you literally have nothing else at your disposal, get some vice grips, clamp onto the nail head and twist it until it breaks, or drive it in flush, or break it off with a cold chisel or hammer claw or hack saw it off or snap it with dikes or fence pliers or....just be a little resourceful.
You need a drill/ bit self tapper screws to fasten the new piece of tin to the frame. Or drill/rivet or something.

Seriously, this is a good start to learning how to fix little stuff that someone else will charge you a bunch of money for.
Ask a neighbor, friend, co worker, someone. You can do this pretty easy.

That's what the guy at the dealership recommended, but like I said, I'm not mechanically inclined.

The best drill I have is relatively weak, I think. Would I need a particularly strong drill to do this? Does metal require a specific type of drill bit?

Leave it in place, get a self tapping metal screw, pre drill small hole close to the old mounting point and reinstall.

Cut off wheel IMO.

Hm. None of those sound like viable ways for me to do it. I'm not particularly mechanically inclined.

Right now I'm thinking maybe I'll just attach it on the skirting end and slide it over the top of the nail and maybe use wire to tie it down.

I understand it may make assembly of the RV faster, but it sure makes fixing it harder.

This is what it would look like

That’s hardened steel. A grinder is the proper tool.