I have a great power jack for your 2015 Keystone Passport Ultra Light exp171. It is the Buyer's Products Electric Trailer Jack item # 3370093500. This jack has a 3,500 lbs weight capacity and would be perfect for your travel trailer. It comes with a 7-Way RV-style plug that pulls power from your vehicle's trailer connector to operate the jack. It has a retracted height of 9-1/2" and an extended height of 27-1/2". view full answer...