Lot of things wrong with this guy's efforts. Even though it's advertised as "Truck Ramps"
I would not have used them for trucks with manual shift. He needed to have stops on the floor to keep them from sliding forward. A safety observer/helper would have gone a long way as well to assist on guiding the vehicle on. The weight on the ramps should be held by the bottle jack and not the two 1" vertical safety posts. Only difference between a 3k rated ramp and a 5k rated ramp are the bottle jacks used,

Opinion: For my use on the Xfire they should work out just fine as long as they won't hit the front of the bumper before hitting the tires. Both my Xfires are automatics. Not too concerned with weight because front weight should be around 1800 lbs by my "guess" and a lot less if used on the rear. If I need to pull a tire, for break work, I will use jack stands under the front crossmember and pull the ramp out of the way. If it was just break work I wouldn't use the ramps anyways!