So I have been thinking about putting another seat on my bike but have some questions. Would a 2 up sportster seat give the driver more room than stock. Sometimes when I am riding I wish I could move back a bit but the large hump on the stock seats will dig into my back. Second, what kind of mods need to be done to a sportster seat to make it fit? And third, will my sissy bar and luggage rack still fit on the bike? Pictures would be helpful.