Welcome to the forum
It sounds like you have a short. If you have a multi meter and some time, you’ll can pinpoint the short.
Set the meter to continuity, and test at the fuse panel. Red to the load side of the fuse and black to ground. If it reads 0 resistance, go to the first light and remove it. Inspect for metal insulation shavings in the switch. If clear, remove the positive lead and test the wire at the light. Repeat at each light, report back.
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2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.