Question,most Hyd system use only 1 ram for the small slide. Since you can move the rear and not the front. Indicates that you can release the hyd pressure. So what is jamming the front side? Have you move the slide seal gasket and made sure the slide is not rubbing on the side of the rig?
Is there only 1 rail or 2 rails?
I don't believe it is impossible to get to the ram by removing the motor or floor. Have you look at the sub floor from within the storage compartments?
Sorry I cannot be of further help