As to your safety 2x4s, the load is not supported on the 'span' section of the board, but only in the vertical dimension. That said, pick up some better jackstands...they are cheap compared to crushed 4x4wire members.

I am not the fourth to point his finger of non-guilt at one's self. My pink 60s block were essential in changing service bodies on my SoCal Dodge trucks: them and a hi-lift did wonders. <img src="/forums/images/graemlins/zombie.gif" alt="" />

1987 Raider - Roxy
1988 Mighty Max 2.6L Turbo - Pearl
1997 Mountaineer V8 - Freddy
2000 Excursion V10 - Freya