Mountain bike shoes/pedal system with a road bike is fine. Many people I know do it, even me. I prefer mountain style shoes because with the recessed cleat, I can walk in them. Perfect for bike touring when you stop to take pictures, walk around to enjoy the scenery, or stop at a cafe along the way. And you mentioned hooking up the child trailer to it. I don't know about your kids but with mine I have to stop at almost every playground that we come across on my rides with them. I can easily chase them around the playground in my shoes without having to carry around a second pair - something I'd probably forget to do when I really needed them. Just check for pieces of bark chips that can get lodged in the cleats. They can make engaging and disengaging difficult. They are also great for bike errands, too.
As for the garage, we don't even try to park our cars in there. We have a stand (it holds a couple of bikes) that we puchased when we had to store our bikes inside with us in an apartment. A few floor stands to keep the kids bikes organized and easily accessible to them. And a couple of them are just leaned up against a wall. I'm thinking about getting a couple of the bike pulley systems so I can hang bikes on the ceiling.
Our stand is similar to this one:
http://www.performancebike.com/shop/...slisearch=true
If you have wall space to lean it against, there's this:
http://www.performancebike.com/shop/...slisearch=true
Our floor stands:
http://www.costco.com/Browse/Product...se=&lang=en-US
Bike pulley:
http://www.costco.com/Browse/Product...se=&lang=en-US
The good ole wall brackets sold in the home improvement isle would work too.
ETA: I just counted our bikes in my head and we have eight. The one I just purchased from uforgot will make nine. The Xtracycle that Dh is planning to build will make ten.I swear they're breeding in there. I'm just not sure how though.
Dh's and mine are both girls.
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