Transmission

Probably a trip to a transmission shop to have them diagnose where the leak is coming from and what it will take to fix it.

i bet it is the front seal. it leaks under the stress of pulling all the weight. have a trans shop check it for you to verify and give you a bid. Roy

Concern would be if the fluid leakage is coming from the vent on the transmission. If so, this indicates the transmission is getting hotter than it should. Most internal transmission failures are caused by overheating. Need to have this checked soon.