I went to Harbor Freight to purchase a jack and jack stand last night. Sure, I could have ordered on Amazon, and I could have bought some brand name stuff (which, in some cases, I absolutely prefer), but I’ve come to respect the higher-end tools and equipment Harbor Freight sells based on reviews, and personal experience.
I picked out a jack and jack stands based on features and price, and got them home. My son looked at the jack and jack stands and started smiling. “Umm, I don’t think these will work for your rig,” he said. I looked at the stuff I bought, and I looked over at my 4Runner, and I knew exactly what he was talking about. The jack stands were too short, and the jack would likely be unable to lift a tire off the ground lifting from the frame.
We tested the jack; sure enough, it didn’t lift high enough. I had to take the jack back and exchange it for the most expensive jack they had which lifted to 24”. When I got it home, we tested it, and sure enough, it can get the tires off the ground. I wanted to get a new jack stand, but they were all out. I’ll likely pick up a pair on Amazon. As for the jack stands I bought, my son kept them and paid me for them. He needed a set for his project car, and the set I bought are really nice and light-weight.
When purchasing jacks and jack stands for 4WD vehicles, you have to take into consideration not only the weight and lifting method (frame, jack point, etc), but also the height of your vehicle prior to lifting. You should make sure that the jack has enough lifting ability to get your vehicle off the ground enough to change a tire.
As for any jack operations, you should always use wheel chocks and jack stands. NEVER go under any vehicle without a jack stand. Hydraulic and mechanical jacks can fail with fatal consequences. Jack stands should be rated for the weight of the vehicle, at a minimum, and more is always better than less.