i dont have the same trunk problem.. but i remember we used to have that problem with our dodge van when the hydraulic shock things gave out... heres the fix...
open your trunk and put on end of a baseball bat (in the vans case we used a hockey stick) on the floor of the trunk and the other end on the inside of the trunk lid.. works great..
for all you show people.. use shorter or longer bat for desired height.. and i think blue or red anodized and maybe even polished bats are available from easton or louisville slugger..
on a more serious note... if you felt how heavy that van door was without the hydraulic things... you wouldn't take the hydraulic things on your car for granted...
as stated by isaac.. "and now you know..."