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We use them all the time at work for full size school buses. Never an issue as long as they are in the appropriate position and have the correct weight rating for what you are supporting.

If the circuit contains just lights you can load it up to 1440w, if you put any receptacles on that circuit you are limited to 12 devices.

From the OESC 6-312 Condensation in consumer’s service raceway (1) The consumer’s service raceway entering a building shall be sealed and shall be suitably drained where it enters the building above grade level. So yes a drain hole has to be drilled into the bottom of the LB.