said base is supported by said bracket at four supporting portions equivalent to corners of a square or {HEAD ~ a rectangle} having {TAIL ~ two sides} thereof extending along a front/rear direction and said load sensor are provided at, at least, two of said supporting portions; and further provided with: 
having
said base is supported by said bracket at four supporting portions equivalent to corners of a square or { HEAD ~ a rectangle } having { TAIL ~ two sides } thereof extending along a front / rear direction and said load sensor are provided at , at least , two of said supporting portions ; and further provided with :
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH