Hawk Crawler Game Cart has lots of good reviews if you can figure hitch/attachment method to ATV rack. The biggest complaint seems to be tire durability over time. Youtube videos showing number of E-bike users adapting cart to bikes. Need to do your price checking though.
https://www.cabelas.ca/product/98225...riantId=276390. Versus
https://www.canadiantire.ca/en/pdp/h...awler+cart#srp.