The best way to load is front first You can always let the carrier roll back to a clear area when unloading.
My first drive in my carrier I went 10 feet and blew the coupling for the rear end /tranny mount ( make sure the coupling is secure),The second drive 2 months later I had a great time driving up and down my driveway untill I backed up to park and stopped to check how close to my truck i was ,and found out I was about 2 1/2 half inches to close ,requiring me to buy a new bumper. Its the only time ive smiled at destroying somthing that cost$ 200 to repair .The Power of the first Carrier Drive.
Jeff
Ps a ground guide is a good idea when backing.