How much power do you need on the rack?
12v or 24v system?
And how fancy/functional does it need to be?
You could have a look at
6 pin harting connectors, they are big and bulky and they do last but I've never used them outside for a long time.
Phoenix contact produce a "
HEAVYCON" plug up to IP69K.
Another nice and smaller connector would be a ip67 M12 connector, do a google search you'll find them.
A google search for "ip67 connectors" will find you a big range of waterproof connectors.
On a lot of campers for solar panels and such they do not use connectors but a simple throug-roof-junction box. The only thing is, this is not easy to disconnect.
Or like
@JCruse said, some good quality "cable glands". These are also not easy to disconnect.
You could also go ultra fancy and use some sort of wireless power transfer. The picture below is a system that I designed and implement in some factories for wireless charging etc (pcb's not pictured). The system below does about 100 watts at 12v, but 200w should not be a problem.
I once thought about using this for a roof lightbar on my own LC100. No cables ziptied to the body, no holes in the body and no cables through the doors. I know this isn't really an easy option but I thought I'd mention an "out of the box" solution. Oh and metal between the coils won't work. A hole or a cable through the door would be easier, more efficient and a lot cheaper.
