On Sunday, May 25, 2014 8:40:31 AM UTC-4, John H. wrote:

My trailer runs about 10,500 lbs, but the truck already has a factory installed auxiliary

transmission oil cooler as part of the towing package. I'm beginning to think I'm worrying too much.

If the truck is factory rated to tow that much, leave it alone. The factory ratings are conservative for liability and warranty reasons.

Save your money for another RC airplane!