The Power Gear system on Precept uses "ATF". The manual does not specify what type, only says ATF. Dextron will be most common and easy to find so just buy that.
2015 Jayco Precept 35UN
Towing JEEP TJ with Roadmaster plates and bar w/Blue Ox Patriot brake
an Aluma low bed trailer with HD Road King and/or Polaris RZR onboard