Metallic Detais has just released a 1/48th USN loading cart with torpedo Mk-46 resin kit - ref. MDR4851
Sources:
http://metdetails.com/catalog/metalic-details/accessory/148/mdr4851-usn-loading-cart-torpedo-mk-46
https://www.facebook.com/metdetails/posts/1283085681902448
V.P.