That depends on your springs, and the weight you're going to be lifting. If your springs are in good condition and you're only going to be lifting a modest amount of weight, spacers may be an appropriate solution. But if your Rav4's springs are old and tired, or if you're going to be lifting a lot more weight than usual, a lift kit is the better option. A lift kit will ensure that your springs are properly performance-enhanced, without the added risk of spacer system failure.