I remember a hole under my 2005 Jay Feather LGT that was near the front. IIRC it was a junction box for the battery leads and the trailer lights/brakes wires on the rear end of the cable that plugs into the back of the tow vehicle.
FAA A&P mechanic, ex-RV dealer parts dept
Retired B-52 Gunner/Flight Examiner, B-52 Crew Chief
2016 Jayco Eagle HT 29.5 FBDS w/ 15,000 BTU AC, 50 amp service, upgraded counter top, thermal pane windows, elec. stab jacks, outside grill, backup camera and MORryde pin box.
2011 GMC 2500HD DURAMAX/ ALLISON