Glen - a 60 tradewind - major cool. I looked everywhere for one of those, ended up with my 58 overlander.
Anyway should not have clearcoat on it. The way to find out is take a bit of toothpaste and rub it on - if your cloth turns black - there is no clearcoat.
On those old trailers you need something a bit more aggressive than what your using - look at www.airstreamdreams.com
- they have both Rollite and Nuvite products. I would suggest you get there sample pack which has all grades of polish/compound and start polishing away. What you want to do is try the least agressive polish first, if that doesn't work, then go to the next agressive.
There has been a lot of discussion about polishing on this forum - may want to do a search - you'll get lots of opinions. I only use aircraft approved polish - you don't want to use any acid on your trailer - causes leaks.
Welcome to the forum - keep asking away, and...... send us pictures!