heater advice

[davyboy]

I am looking for a heater to install for the back of my truck. I have a 98 Toyota Tacoma with a canopy on it. I have two weimaraners and a lab that i like to take everywhere with me. The weims get cold pretty easily and am looking for a 12 volt heater or other option to keep them warm. Any one here have a set up they want to share or advice on a descent heater.

[Ridgeratt]

Find one out of an old land cruiser it runs off of the radiator and is fan controlled. Have one in my jeep and it works great.