Any recommendations on non-slip for trailer fenders & the steps? I was looking for the stuff Myco uses, but can't seem to find it in my google searches. May have to give them a call.

Parts from myco are usually very reasonable. I did mine with sea dek

If you are looking for something with traction then go visit a local skate shop....you can get grip tape that's 9" wide by 33" long or if you lucky they have rolls of the stuff you can have cut to the length you want.....just about any color too if you wanted to try and blend it to the trailer colors. I did it on my last trailer but my current one doesn't have any support to stand on the fenders so i didn't bother.

i ended up buying the strips myco uses.

You can buy rubber pads from Harbor Freight that have a diamond plate type pattern. And Lowe's and Home Depot sell "traction tape" as well. I bought a 4" wide roll online years ago and have used it for a bunch of stuff. You can cut it down to whatever you need.

Traction tape - Amazon