As long as everything was turned off when you connected the battery it should be okay. The main concern would be the converter, did it or did it not blow when the battery was connected backwards. The reverse polarity protection is probably in it. To check, leave everything turned off, connect your voltmeter up to the battery and take a reading, while still connected plug in the converter and check the voltage should jump up to at least 13.6 volts. If no change check converter for fuses, if none you blew the converter.
If the converter is equipped with reverse polarity protection fuses, and those are the fuses you blew, simply correct your error, replace the fuses, and go camping! The only thing it cost you was two fuses, and a lesson-learned.
If, in fact, your converter got cooked by your error (which is unlikely at best), now is your opportunity to replace it with one that has good three-stage charging and reverse polarity protection. They're not terribly difficult to find, and not too tough to replace, even for a shade-tree mechanic.
To prevent it in the future, tags with labels, and/or diagrams and/or colored electrical tape are handy markers.
Verizon uses the same wiring colors on their batteries in those boxes you see in your neighborhood. Well one day in a hurry changing out the batteries in one I wondered why the thing started to smoke. Yep I did the same thing black to neg and white to pos. but there was no circuit breakers going from the batteries. A lot of people were out of phone service for a few hours till we got some replacement circuit cards and power supply for it. Learned to take my time after that.
06 Montana 3000RK
07 Dodge 3500 Dually Sport 6.7 Diesel
07 Pearl White Ultra Classic (My new Baby)
10 Cadillac CTS
Texas Boomers---Stop by for a Margie some time!
There's a guy on the Keystone forum that just did the same thing. If after you but it back together it blows the fuses again call the manufacture of the converter. It looks like he's getting his replaced under warranty as the fuses should have protected the converter.