My K5 does not currently have a jack for changing tires. I know most everyone uses high lift jacks but my question is this...do I really need one? Would a bottle jack and a couple blocks of wood not work just as good? Also, If it is in my best interest to go ahead and get the high lift jack where do I place the jack to change a tire if the cituation arrises? I have a 89K5 Blazer with stock bumpers and currently no lift. Any help would greatly be appreciated! Thanks!