If Tiffin used A/C units with sump pumps in 2007, it would be draining under the rear cap. Look for PEX piping with duck bills on the end. These can get kind plugged so give them a squeeze. If nothing comes out, then the pump may be bad or the tubbing plugged.
If you don't have the sump system, it will drain across the roof to the low point and drip off through the rain gutters.
Roger & Mary
2017 Winnebago Navion 24V (Sold)
2014 Tiffin Phaeton 36GH (Sold)