Second, if you pick through the Federal and State DOT regs, I think most docking lights are technically illegal. I don't think you are permitted to have side facing white lights.
Not true.First of all, there are really no applicable "Federal" regulations for non-commercial motor vehicles, other than the fact that all states are forced (by threat of withholding federal highway funding) to adopt FMVSS 108, which specifies, among other things, minimum lighting standards.Most states have additional regulation over and above what is in FMVSS 108. But almost all of them have allowance for "work" lighting -- white is universally allowed, and some states allow other colors such as amber. Think about it: without this exemption all those RV "patio" lights would be illegal, and yet every motorhome made includes one.The key, though, is that most states forbid these lights to be illuminated while the vehicle is being "operated" on a "highway" or "roadway". So you could be pulled over, for example, for driving with that wimpy little patio light on. Also, many states require that any forward-facing white lights other than those legal for driving use be covered while under way. (We've got giant Hella HID flood lights, like the ones on excavators, mounted on the roof, however, and nary a word has ever been said to us -- I'm prepared to cover them, though, if need be.)Once you're off the road and backing into your camp site, you can use all the white work lights you want.So "docking lights" and all those extra patio lights that the big conversions use are all legal.