Not a Lance owner but Yes the Lance plug is different, its advantage as I understand is it uses or will accept larger wiring for the power in. Which even IF truck had a bed receptacle you might want to change to utilize. Or add second Lance plug. There are quite a few threads regarding this- couple of older ones in the TCU as to wiring.
But unless added by p/o truck wouldn't have bed plug and if it does likely a standard 7 pin & wiring (unless p/o had Lance). IF I had a Lance I would wire truck to utilize the larger power wire size potential (at minimum). Tapping trucks existing trailer tow wiring, its usually fairly small ga.