We purchased this dimmer for our awning LED's. Since the interior lights were incandescent, we swapped those out too.
Bulbs for inside http://smile.amazon.com/gp/product/B00EKN8FXC/ref=oh_aui_detailpage_o08_s00?ie=UTF8&psc=1
Dimmer came from Ebay
http://www.ebay.com/itm/BRAND-NEW-EXCLUSIVE-RV-LED-DIMMER-SWITCH-DUAL-CHANNEL-FOR-LED-LIGHTING-LIGHTS-/271388164776?pt=Motors_RV_Trailer_Camper_Parts_Accessories&hash=item3f2ffec2a8&vxp=mtrhttp://www.ebay.com/itm/BRAND-NEW-EXCLUSIVE-RV-LED-DIMMER-SWITCH-DUAL-CHANNEL-FOR-LED-LIGHTING-LIGHTS-/271388164776?pt=Motors_RV_Trailer_Camper_Parts_Accessories&hash=item3f2ffec2a8&vxp=mtr