I don't know of any brands off hand but get one that doesn't use a 9volt battery. They don't last. Also ck into if they have a car adapter to run them on 12volts when in the truck. I have a old set of portables they are Uniden and they work well. They have 2 different battery holders. One for 1. 5 volt throw-aways and one for 1. 2 volt ni-cads. One thing nice about portables is if you are trying to park in a tight place, your other half can guide you in at the back of the trailer