The heavy-duty radiator for the 2019 Toyota Sienna is standard for those models with the factory towing prep package. It looks like the LE trim has the prep package as a standard, but I could not confirm this 100%. Your best bet is to call your local Toyota dealer and find out if your model has the prep package. If you have it, then you have the heavy-duty radiator and cooling fans.
If you're looking for a hitch to use with that prep package, I recommend the etrailer Class III Hidden Tube,... view full answer...