I owned two X's prior to my current vehicle. I towed a 11K GVW TT typically loaded to about 10K. The 2001 7.3 PSD X aor the 2000 V-10 X had no problem towing my TT anywhere I cared to go.
The X is a very capable TV. It can be a bit finicky getting it dialed in due to the soft/weak/weird rear suspension however many have found a cure using roadmaster active suspension, air bags or rear sway bar.
I preferred to use a Hensley hitch, however others may think the Hensley is overkill. I was not 100% satisfied with the overall towing performance in all conditions until I installed the HA.
Bottom line is the X is a beast of a tow vehicle more capable than its mysterious rating however it is a bit tricky to dial in and requires a bit of effort to do it right. I strongly suggest your friends take the time to know all their weights and dial in the hitch properly. A few trips to the scales will be required to do it right. Do not guess at or assume any of the weights
Once the X and hitch are set up correctly they will have a rock solid combo.
