Anyone know where you can pick up a second keyless entry switch for a 1999 VX????

And i'm looking through the owners manual on the VX and it says it doesn't recommend towing with it, but yet you can get a towing option? how does that work?

I don't need to tow more then five or six hundred pounds, and don't think it should be much of an issue, but was wondering if anyone had heard any horror stories regarding this.