I dunno about the tailights but you should be more careful in your work practises.
You should have a cover over your welder. What would happen if it rained you idiot?
You could paint some tread on those tyres....Oh, hey buddy just wanted to say how pleased I was to see you taking some safety precautions, I don't know how many times I've seen people working on their truck without chocking the wheel...bloody dangerous so well done.