Here is a large collection of Jeep models:
http://kamakura.cool.ne.jp/toshimi3/jeep1.htm

I found your 'Bushwacker'
http://zh1968.hp.infoseek.co.jp/mc285/288CJbushwacker.htm
and 'Coyote'
http://toshimi3.hp.infoseek.co.jp/mc824/824rc_blue.htm
but only with information on the models, not on the possible origin of the names.