Check the Plumbing Forum and Use Search
There are lots of possible places for water to leak. It may or may not be the plumbing. By now you've probably found the valve to turn off the water supply to the toilet. If you haven't found the valve... look behind the toilet - you should find something there.
It may be one of the various fittings or valve associated with the toilet. Look on line to find your manufacturer and then look for customer service, manuals, etc. If yours is a Thetford I know you can find information about them online.
It's not uncommon for the flush valve to crack and leak water but that's usually at the rear of the toilet. Did the water migrate via the carpet and underlayment so you found it at the front of the toilet? Or is it clearly a separate wet spot in front of (and away from) the toilet.
Hmmm... don't know if that helps you. Take some time to look on the plumbing portion of AirForums and also use the seach feature to look for your specific brand/model.
Good luck and welcome to the forums.
Lucius and Danielle
1992 29' Excella Classic
1996 GMC Suburban C2500 7.4L
2005 Chevrolet Suburban K2500 8.1L
Got a cooped-up feeling, gotta get out of town, got those Airstream campin' blues...