For a 24 Foot Artic Fox, this is a DIY project. I did it, Pianotuna did it, you can do it. 200 to 300 watts should have you covered, add in a good 30 PWM charge controller, use fat wire from the charge controller to the batteries, and mount the charge controller inside, as close as you can to the batteries, without exposing them to recharging acidic fumes of the batteries, and you should be good to go.
The most important part is learning how to properly recharge, top charge, and equalize charge your batteries, and maintain them, as well as manage the water level properly in your batteries, so that they live a long and efficient and inexpensive to you life between replacements.
If you'd like to geek out over those last 4 or 5 items and learn the right way to do so, use the search function here and read the story of "My Screwy 31"... it's a textbook example of learning how important charge voltage and charge amperage is to properly recharging and maintaining a battery.
