We have a 3" seat belt extender for my wife's new RAV4 from here:

Seat Belt Extender Pros® - Your Source for Safe Seat Belt Extensions

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We use for our 7 year old who sits in a booster seat
The issue has nothing to do with the length of the seat belt but rather how much the female buckle socket extends (actually stock situation it doesn't extend at all) out from the seat. As an adult, it is a challenge to reach over the booster seat and get the buckle into the socket and for the child it is next to impossible.
If I had to do it over, I would probably have ordered the next size longer (than 3") but it is safe, well made and my daughter can now buckle her self in.

 

Given that the booster elevates them, there would be no impact on seat belt length that would suggest an extension would be needed. Keep in mind that the belt length is designed for Santa sized folk. It may be a little stiff at first. And hard for them to find the female socket.

Can you attach the buckle? I know with my grandkids, I had to do the buckle up for a while and then their strength increased and all I had to do is ask for a count of "clicks" and they had no trouble.

 

Doesn't this effect the whole buckle system? When you have kids in the back the dash will tell you of they are buckled or not. I would this this would always show they are buckled even if they are not. Kids be kids and kids do weird stuff....I would like to know if they are buckled then to rely on them telling me they are buckled....just my 2 cents.

 

I can check out whether or not the dash display is affected but our daughter is just as concerned with her being buckled in as we are so that is a non issue for our family. It's more important that she can do the buckling herself for us.

 

I got to wondering why the manufacturers don't make the seat belt female buckle socket attachment to the frame a semi-rigid item and have it project just an inch higher. If it were higher and not moving around as easily then anyone would have an easier time attaching the belt end into the socket. And releasing it.

 

Anyone use this one that makes it rigid and seem a bit higher? https://www.seatbeltextenderpros.co...nderpros.com/buckle-booster-seat-belt-receptacle-raiser/#productReviews-content

 

I don't think that you can actually raise up the female socket enough for that to work? Wife is away with her RAV right now but you should go ahead and simply check to see if there is enough slack in the stock system for that to work. From my limited recollection while installing the 3" extender, I don't believe there is much if any slack.

 

You are right. The buckle receptacle is at seat height and pretty rigid. So the item I asked about above wouldn't work.

Thank goodness my 8 year old is now proud he can do it himself and the two older ones have been buckling up for years.

 

Toyota dealers are supposed to give you extender for free if you request one. Page 32 of my pdf manual.

 

I called them, they said it's meant for larger adults, not meant for car seats and booster seats. For now just the kids have to get more practice or I reach over the booster seat and do it.