beginer traveler!

I'm a new father and I would like to start doing small trip with my family to close by rivers and lakes . I been reading the I may need to add a transmission cooler to pull a trailer and manual call for 6300 pounds capacity tow . and I not planing to pull all that weight . can I get a help with what brand or type of cooler can I add to it!
Thank's in advance!

 

I will never tow near capacity in a 4 runner. I always limit towing to 80 percent of max towing and would still add airbags and a brake controller. A short wheelbase, soft suspended suv like the 4 is not the greatest of tow vehicles. Yes it will tow things and I tow my dirt bikes all the time but I would suggest to get a proper tow vehicle if you need to tow max or more than max of what the 4 can tow. YMMV.