Those 4x6 mats are a gigantic fucking PITA to move. I bought 6 of them from a gym warehouse when I was setting up my basement squat rack and had to rent a flatbed pick-up. No way I could have fit 6 in my hatchback. Not sure how you do six in a Mustang - maybe strapped to the roof of the car like a Xmas tree but even that would be dangerous as hell.
And each mat is a 2-man carry. If you move them by yourself like I had to they'll turn you into the world's angriest man. Each mat weighs ~150 lbs and jiggly so you can't get a firm grip anywhere. Imagine trying to drag Charles Oliveira through your yard/house and he doesn't want to go. You can't grab his arms/legs/head and can't lock your arms anywhere around his body. Also he has the texture of a pencil eraser and skids/sticks to everything on the ground, picking up leaves, mud and dust and tracking that into your house, while knocking shit over along the way and calling you a Creonte.