I am hoping to accomplish a 63-mile ride for Kids in Distress in December. I currently lack endurance to do the ride and am ramping up my riding/distance for this event. My average rides are around 30-miles.

Would it be beneficial to add weight, such as carrying a backpack during my rides (10-extra pounds)?
I also hope to have dropped 15-pounds by December which might make a difference?
Any suggestions to increase my endurance in this short timeframe?

Thanks,
Mike