I am going to buy a trampoline for the 2 dcs and can't decide between 8ft or 10ft. I have read that only one child can go on an 8ft at a time and that you have to have a minimum 10ft one if you want 2 kids on at one time (even though I know it's not really recommended to have more than one child at any size). Is this true - does anybody here have 2 kids on an 8ft one and is there enough room for them to bounce together? Is the extra space on a 10ft really that much better?