I too have put jackstands just as you have, but I like putting them under the frame further back rather then the axle only because it provides more area under my 3100 to move around.Wherever you place them, I think the really important thing is to make sure the stands are fully engaged and as suggested,rock the truck after it's on the stands to check for stability. Keep in mind that the stands with a slide bar of teeth and locking lever actually rely on weight to keep them tightly engaged. When shopping for stands,checking for safety f-eatures is a must. Most truck jacking points for flats are under the axle,not on the body .
Last edited by cletis; 02/11/2010 12:31 AM. Reason: tricked automatic link