Oops.

[Footy Shorts Shane]

Picked up an old Jayco a while back and found this when I removed the rear sheeting.

Tail light housing screw straight into the 240v cable. Well done Jayco 

[D4D]

Standard operating procedure

[plusnq]

Shocking

[Patr80l]

Those staples look a bit light-weight too.

[avotrol]

Yep, professionals at their best!

[Crimso]

Deceased estate?

[Campa]

Pretty standard for Jayco craftsmanship.

[theins]

Is that supposed to be a case for "aussie made"

[tracker]

Is that supposed to be a case for "aussie made"

  And lot's of people whinge about the imported stuff...i'm starting to wonder...
                                                                  Cheers Tracker.

[callmejoe]

You got it wrong.
It was part of the build process.  Screwing in solid cable as shown helps strengthen the chassis.  While also earthing out the positive power supply. 
Standard practice. 

[Flightrisk]

Earth screw? If that's the worst you find in your jayco you're doing well. I'm just starting my fight with them for a list a mile long of poor workmanship!

[Footy Shorts Shane]

Found another one 

[edz]

Always with the negative waves Moriarity,   https://www.youtube.com/watch?v=ncbEucjsNFU
You got to look on the positive side of things, like how talented the fitter was to be able to hit the same wire twice in different locations and while it was hidden behind a solid covering  panel... essentialy blindfolded .

[#jonesy]

Staples must have been on special!  There are so many there, that they have made it weaker.

If the screws went through the wire how was it not shorting out?

[dales133]

Makes mine look like total overkill but I've removed the skins on several caravans an thier all built the same
Makes you wonder where all the money you pay for them gos

[Black Diamond]

Great workmanship

[richee]

I think they are meant to be like that - stops the cable from slapping against the cladding 

[dales133]

If they don't blow up or fall apart how are they spoked to sell you another one

[Footy Shorts Shane]

If the screws went through the wire how was it not shorting out?

The second photo, I think the White wire is ground and black is the hot wire from trailer plug to run the fridge on 12v. Not sure, didn't bother to meter it out. All fixed with a pair of side cutters 
As for the first pic, I stuck a screw back into so as to not let any smoke out 

I think they are meant to be like that - stops the cable from slapping against the cladding