The one item I dont have a regret of buying from LMC (There are more I dont regret but....Another day)
It's not so much "heavy duty" but more like a whole harness which takes the drain from your OEM circuit and instead taps a new circuit straight from the battery (with relays). Heavy duty......Maybe by one or two wire gauge.
But, yes - Great buy and easy installation. Be sure your grounds are solid or your lights will be dim.
Troy B
Ft Hood, TX