This article is from the Toyota Tundra FAQ, by Steve Yee with numerous contributions by others.
Yes, you can. Many owners on TundraSolutions.com have reported no problems in
using a fifth wheel to tow horse trailers, goosenecks, etc.
The most recommended combination from owners has been one made by Reese, using
a Reese 16K hitch (model number 30047) and a Reese Kwik Slide.
 
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