2011 Ford F-250 Super Duty XLT

2011 Ford F250 xlt crew cab 199K miles 6.7 powerstroke diesel, 4x4, short bed, Power windows, power locks, power and heated mirrors, cruise control, Air conditioning, power seat, bed liner. truck has an issue shutting down when pulling a trailer and around 65-75 mph, Put it in neutral and start it up again but will continue to repeat this issue, it will drive fine if your 50-55 mph, I drive this every day. Both fuel filters including low pressure pump and air filters have recently been changed,