Some might say I service my tranny too often as I have the dealer do the flush every 15,000-18,000 miles.

I'd rather be safe than sorry as 60,000+ of the 80,000 miles on the trk have been towing our 1/5 whl trailer with a combined weight at 21,200lbs. which is a pinky over the max. gross for the trk.

If we didn't tow as much at the max. gross then I'd go with the recommended 30,000 change interval.