2013 need to replace rear shocks

I have a leaking rear shocks and want to replace them.
The truck is not lifted and I will be doing some heavy towing and will be living on bumpy dirt roads in Mexico. So could you guys suggest some good rear shocks to use?
Thanks in advance!

 

Get a pair of Bilstein 4600 heavy duty shocks. They are the same as the 5100’s except they are made for stock height trucks not lifted trucks.

 

Look into Add a leafs or new leaf packs too. Those will go a long way in reducing the bed drop when you attach the load. Depending on the load consider air bags