SO much controversy over power cords.
Here's what I ended up doing..
http://www.amazon.com/gp/product/B00..._luc_sbs_02_02
Switch over (everything)to the NEMA 6-50 plugs, what’s commonly referred to as a NEMA welder plug, (it's what the Big M puts on there’s) here's a link to 25' 8/3 cord with molded on 6-50p and 6-50r lighted ends, rated at 50A for pretty cheep. ($66)The male ends can be found on Amazon as well for about $12. the L14-30 plugs are commonly used on generators if you go that route but they are only 'rated' at 30A. If you want over 50A it's a big step to something like a Hubble 4100 (100A) like a couple hundred bucks for the connectors.
Just MHO. Take it or leave it.
Ray