Instruction manual written by Chinese. Totally useless. Wife and I struggled from lack of understandable instructions. One of the most blatant is that the 'folding process' -even the AI version - says just pull up the inside handle --helps if you first unsnap the safety strap on the underside. The side rails take some practise- either be very strong, or brace the wheel with your foot to span the side to accept the side brace. Always wonder why the engineer types who write up these manuals don't ask the newest female employee to try to open, assemble, and fold their wagons. They might learn what to add to their very superficial instructions. But don't hold your breath.
On the positive side, this will be very helpful for 4 and 6 year old grandkids when they weary of walking 3 miles in an amusement park. Big wheels roll nicely, canopy looks useful . Pleased with purchase but ask a more mechanical friend how to operate it.