As Dave says, the only really relevant weight info for a wheel is the load rating, and it would be unlikely if the load rating of a wheel is to low for a medium sized SUVs GVW. What is something that I think you could (and probably SHOULD) check is if the wheel has the right fitting for the car. All to often, the only thing people check is that a replacement wheel set has the right number of holes (4 or 5 usually) and that the PCD is compatible (so for the RAV4, that would be 5 x 114.3). BUT equally - and more so really - is to make sure the Centre Bore on the wheel matches the the Centre Bore on the car. For the RAV4, the Bore is 60.1 - if the wheel centre bore is smaller, then it will not fit anyway, but if it s larger, then the wheel will be supported by the wheel studs only and not centrally on the hub. The studs are not designed to take the weight, they are mostly only there to stop the wheel falling off! It is perfectly ok to make the wheel Centre Bore smaller with a reducing spigot ring to match the cars Bore, but larger and no reducing ring fitted, it would be most unsafe.