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I have towed bikes and trikes for years. Best thing you can do is get a front tire bracket bolted to the floor. I use eye bolts for my straps. Front and back. Make sure it is a drive on bracket. Once the front tire is planted into the bracket, the bike or trike will NOT move. To make peace of mind, strap two straps to the front and two straps to the back. When strapping down the front, get on the bike and have wife tighten the straps. You will bounce on the front forks. Don't over compress! It will hold fine.
Hope this helps. Have a safe trip.