wattagirl~
i am known as the most overprotective parent around so i am sure you can predict what i am going to say. we are from a rural area and a lot of people have 4 wheelers too. a couple of years ago, there was a local child (2 years old) that fell off/ slipped off and was run over by his father. it was horrible!!!

i think sometimes we see the fun in things and forget about the danger! about 6 years ago, another small child who was about 7 or 8 was helping his father mow grass and the lawnmower became stuck and he hopped off ...not thinking! it ran over him and he was killed instantly. <i know that some mowers have all sorts of safety devices but it isn't always effective>
my son is almost 12 and i have to tell him constantly that he is not allowed to ride either things. there are countless accidents that occur locally that i hear about! my question to my son often is...."does it have a seatbelt?" ....well, he isn't riding!!

i lost my nephew when he was 6 years old to a tragic home accident...it still breaks my heart! we just take for granted the harmful things that surround our families.
Best of Luck! Enjoy life through your little daughter's eyes!