Here is another one of those questions, wondering if anyone out there has "been there done that."

I have been offered a good price on a Gear Venders Over/under drive unit (new) and was thinking about doing it. I am running 4:10's now and doing a reasonable amount of towing (32' Fifthwheel). Not that I am having any problems mind you, but it sounds nice. I was wondering if anyone has such a unit on their trucks (not motorhomes) and what their experience has been like?