Fyi, a friend pulled a U-Haul trailer with his Gen2 Prius 500 miles recently. He had reserved a 4' x 8' and they thought he would be happy that they upgraded him to a 5' x 8'. He was not. He averaged 25 mpg mostly driving 55mph.
Someone else wondered why you need the trailer and I don't think I saw a response to that. A number of years ago our family (mom, dad, two teen daughters) did a coast to coast road trip in our '04 Prius including a lot of camping. We had all the camping gear, two coolers, etc, inside and on the roof and we averaged 50 mpg for those 7500 miles. Key was that we agreed to stick to 60 mph, and my aero-designed roof packing system.
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