RV Repair: leak, bottom corners, travel trailer

Question
i have a 2001pioneer travel trailer and water is leaking into the back  the roof looks ok.  i know its coming from the outside someplace it happens after it rains  it may even be coming in at the bottom corners any way to check this
thanks
Diane  

Answer
unfortunately, the piece of "technical" equipment is serveral thousand dollars that can pin point where water is coming in, so usually we just chase leaks until they stop.  Check you A/C seal I know it probably is not in the area, but I have seen water enter in the middle of the unit and travel to the back or front to get out of the enclosure.  Also check your tow lights for being properly sealed