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I feel as though the most common size is 6x10 enclosed trailer, so if it works for most people, best bet is that's a pretty usable size, cost benefits, balance. Been struggling with it myself as for the past 3 years I've been using an enclosed 5x8 and hauling 2 bikes. Super cramped, super pain in the butt, the benefits is I can pull it with a medium size car! Since it is small, it doesn't affect the MPG in my 03 Olds Bravada all that much. With that said, since my 5x8 works for now, I'm not actively looking, when it dies or some great deal on a 6x10 comes along, I'll be up for upgrading and taking full advantage of having the extra space!