There are a few things to consider when transporting large items in a car. First, you need to make sure the item will fit in the car. You can do this by measuring the item and comparing it to the dimensions of your car. If it's too big, you may need to rent a larger vehicle.
Once you've confirmed that the item will fit, you need to secure it so it doesn't move around while you're driving. This is especially important if the item is heavy or has sharp edges. You can use straps or rope to tie it down, and padding will help protect your car from scratches or damage.
Finally, be aware of your surroundings when driving with a large item in your car. It's important to give yourself extra space when stopping and starting, and be careful when making turns so you don't hit anything (or anyone).