I took a closer look at that picture, There are special lift/support arms in the bed of the pickup to raise and lower the upper boat/trailer, it appears this is a special truck customized for delivering boats to dealers.
So, how do they get it down... Hydralically that is how
Speaking of getting thigs up/down, Harbor Freight (For those who shop there) has a 12 ton Hydralic jack, this unit is hooked up to use a manual pump in the tradition of bottle jacks or Air over Hydralic in the manner of a shop jack. I'm interested since an 8 ton will pick up my rig but you need more muscle than I have, and I have a fair amount
Air, I have 150PSI of