Problem with the used is there is probably some recall on them..   Last one just turned 3, and we chucked the baby bed, as I think it was suppose to choke everything that came with in 100 yards of it or something..  Seems like they are always recalling the strollers and carseats to..

For what its worth,, we had the combo seat/ stroller thing.  Was nice,      for about 6 months till they grew out of that infant seat....  She ended up buying some el cheapo stroller and used it more than the graco thing..  But we did not do the gravel and grass show..    Hell   get a cheapo first, then see what you will want to do, and spend some more money on what you will need.