My (non expert) opinion of Fauji vehicles is that body wise they are good cause of regular washing / cleaning and general discipline that is inherent with forces BUT faujis are messed up drivers! High RPM shifts and refueling when tank is almost dry and other practices etc.
Also, these vehicles are in good(?) shape as there are tremendous amounts of man hours put into them at MT yards which will be painful for an individual to match.
Vehicles which are sold are ones which are either too old or have become too troublesome. So in short, unless one likes being a greasemonkey, its better to steer away from these and get a proper vehicle from the market.