My first attempt at building a cargo trailer for my Goldwing and Baja Bug. Posted an amateurish video on YouTube

This morning I bought a Harbor Freight tire changer #34542. The price was under $40 with a 20% coupon. I think I also need a "Motorcycle Tire Changer Attachment" #42927 in order to change front/rear GL tires. The HF website says "In Store Only" for the #42927 (about $50) but my local store...