I have seen tinted white chocolate, but not straight caramel, the textures are different.

All these would be do-able with dessert fondues. Crockpots or chafing dishes...

That said, one way to have a chocolate fountain is to hire a person to cater the fountain. It really does take one whole person's worth of time to manage it.

If you are thinking to buy one, you MUST do a test run as long as the wedding. Part of the problem is successfully maintaining the dessert for the whole service.

Foods to dip in a chocolate fountain

You want abpout 8 pieces of various things per person for a full dessert.
2-5 fruit pieces per person, usually including 2 strawberries (see the fruit tray page for info on how many pieces in various types and sizes of fruit). I never use bananas for a large crowd, they look so bad after a short time out, even with Fruit Fresh.
One to 2 ounces (one to three nice squares or fingers) of pound cake or angelfood cake per person if no other cake is being served. They look great and reduce costs.
2 large marshmallows
2 pretzels rods (short)
1 nut cluster.
See if you can avoid maraschino cherries- the fountain is messy enough, and the cherries fall off the stems, and between the red and the chocolate, the stains never come out.