How far away is work? Can you commute by bike? That's a good way to get miles in doing something you'd be doing anyway.

The kids are at an awkward age, being kind of heavy for a trailer, and young to ride, but with thought, and help from DH, maybe the four of you could ride together in the evenings. They might want to get out of the house, and a ride with you could be a treat. Especially if ice cream is involved.

If you don't push them with wildly inflated expectations, you just might have riding companions later.