Welcome to the board!
Agreed on the 2nd generation. They would actually be 8th Generation, but who's counting?
The basic generations are as follows:
1918-1928 4 cyl trucks
1929-1936 First 6 cyl trucks
1937-1940 First modern styled all steel mainstream trucks
1941-1946 little production between '43-'45 in this era due to WWII
1947-1954 Later versions offered with Custum Cab and 5 window.
1955-1959 First V8 pickups. Cameo trucks were first fleetsides
1960-1966 First Generation avail. with options like pb, ps and A/C, etc.
1967-1972 The New Breed. Well optioned trucks became relatively common.
1973-1980 First Generation to use the Silverado nameplate.
1981-1997 First trucks avail with EFI. (Some consider 73-87 the same generation)
1988-1998 EFI became standard.
1999-2006 First trucks to feature LS engines and 4 wheel disc brakes std.
2007-current