Two conflicting answers.. Both by the way are quite possible.
IF, it is drippign from the TPR and runing under the heater on the floor, You can verify by looking at the TPR as it heats, if this is the case, simply turn off the heater, Turn off the water, Pull the drain plug and let it drain, (OPEN the TPR to improve draining) I like to scrw a 1/2 inch pipe into the drain to direct the water OUT of the compartmente but do this carefully if the water is hot (IN SHORT do not do it when the water is hot)
When done, close the TPR, replace the plug (Tape it if you must) and restore water first, then power to the heater.
If it's the seal, fix it.. That leak is damaging yur motor home.
Home is where I park it!