Has anybody had any experience with Diesel fired block heaters like this? http://www.suremarine.com/body.htm The Webasto TSL-17 comes in a kit designed for 99 up Fords. It's about $1200.00. Has anyone installed one in a 97 or similar? They don't specifically make a kit for a 97, but I've been told the difference is only mount brackets & is simple to adapt.