Here are some proportional options... I towed a camper with the time delay controller years ago.. hated it.
The Voyager isn't a bad option for 83 bucks...and thats with the cable for your truck
https://www.etrailer.com/bc-2013_Ni...actory+7-Way&furl=-sf-Proportional_Controller
The Voyager isn't a bad option for 83 bucks...and thats with the cable for your truck
https://www.etrailer.com/bc-2013_Ni...actory+7-Way&furl=-sf-Proportional_Controller