2009HL, 1997 T4R
The absolute bare minimum 10% of the trailer weight and at least 15% if you drive over 55mph. 10% is how Caravans go in Europe but they aren't allowed to drive fast when towing. Their RVs are built differently too but they never go over 55. Over here we think that our towing laws are BS because you see a little hatchback pulling an RV over there. What you don't see is it's 35 miles an hour the whole trip.