Ric,

For the shock installation, expect to pay the going hourly mechanic's rate. I paid about $80. which works out to about one hour of labor. I don't know about your other questions. For my 2003 Rodeo, I bought stock-size Bridgestone AT Revos, they provide a nice ride and are very quiet on the highway. I've also been very satisfied with their performance in the rain and off-highway in Moab. Good luck.

Mark