I can highly recommend Rizk chargers. 100% made in the USA, built (and even looks) like its 1955. Its a true transformer type, very well regulating unit with no electronics nonsense. Very heavy copper leads, with stout alligators. Has been 100% reliable for umpteen hours so far, both at home and at the track.
After going through three made in China Schumacher, Travelers, and ____ (cant remember) units in less than two years. Someone on this forum actually, if im not mistaken, told me about Rizk. Small Family owned for decades and build a very solid unit. I got the P160. Massive amps on start/boost setting!!.... That thing will boost start my 1949 International Bulldozer !!!
Been meaning to buy the little brother to it for other home use...
Here is their website:
http://usabatterychargers.com/
Kevin