These would all I think be 3 star vehicles but I really don't know their exact descriptions. The trucks I believe are a Barris creation but the radical yellow custom I can't find info on anywhere,it's very cool whatever it is or was. Reminds me of the early Hot wheels radical customs. Sounds like Jethro called it a Twin Spear in the show. The VW buggy conversion is any ones guess,possibly a Meyers body. All 4 versions were driven by Jethro in the episode.

Pics:
http://i1197.photobucket.com/albums/aa437/SHT2003/imcdb/TwinSpear.jpg
http://i1197.photobucket.com/albums/aa437/SHT2003/imcdb/manx.jpg
http://i1197.photobucket.com/albums/aa437/SHT2003/imcdb/trucka.jpg
http://i1197.photobucket.com/albums/aa437/SHT2003/imcdb/truckb.jpg