Problems With Accessories (smoke units, couplers, etc...)

[Robert405]

So, in February, I bought a used Bachmann 5th generation 10 wheeler, but I'm having some problems with it. For one, a part for the smoke unit came out of it, and the wire inside the unit started to move around and it ended up burning into the plastic body around the unit, and when I pulled it out of the body, it separated from the metal contacts on both sides. I need a new unit but what should I choose cause I don't want another Bachmann unit. Second, I want to put an operating coupler on the front, but I don't know if it would work because of how much swing is on the front end, and plus, the dummy coupler sits above regular couples. anybody have any advice? Anything would be appreciated very much...