My niece was 5 when she got up on the trainers a few years ago. She and her brother are still using the skis untethered. Those HO skis are very similar to what my brother bought. Good comfortable bindings plays a big part. Good luck.
Your choice 14" - 5 lug trailer wheels
$79 Each - Free Shipping
ST205/75R14 Kenda Loadstar radial trailer tire
$94 Each - Free Shipping
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CARBURETOR REBUILDING - $125 + PARTS
LED trailer lights, Hubs, Spare Tire Carriers, Chrome & Powder Coated Lug Nuts