Unless they have been changed, your lights are 12V. Which doesn't require the inverter. They will run off the battery.
Your rig probably has a converter, not an inverter. That is what they normally come with until you get into the higher end units.
read my answer on the other post you put up today. might help.
__________________
It was a rainy few days at Algonquin Prov park...tarps kept us dry.
Wayne --Belle River (Windsor), Ontario
2013 Sunset Trail Reserve 25RB..(just sold it)
2015 White Chev Silverado 2500HD 4x4 (6.0 l gasser)
2003 Mountain Star 890SBRX Truck Camper