Hood gas strut kits.

The hood is heavy enough to put struts on it! The struts come in strength ratings so dont go crazy on them or else you could damage the hood. My LS400 had a crease in the hood from an incorrect strut intall from the PO. The body shop straightened it for us after someone backed into us. You could get a bathroom scale on the inner fender and put a 2x4 on it to prop up the unspung hood to get an idea of what the hood weight on that point is. My SC hood struts rate like this for an example: