How to set up your trailer....?

[GetANet]

Have a 14 ft starcraft aluminum boat and always seems like I have a hard time getting the boat up on the trailer. One of my questions is , is the boat supposed to just be rolling on the rollers or sliding on the bunks or both. I've been doing it for so long that I get it on and off pretty quick but as I'm getting a little older and have some neck/back issues was wondering if there is an easier way? YA KNOW WORK SMARTER NOT HARDER!!!
My trailer has two three ft bunks and three rollers basically front middle and back. Can any body offer any advice as to how to set it up to make loading and unloading a bit easier for myself. Thanks.......