Since I am old and slow, it would take me some time to get the deck installed.
That being the case, and assuming that you have someplace to put the boat to work on it...could you #1 run the boat to the nearest ramp. #2 position some rollers (see above) and your truck at the ramp. #3 have a couple of 2x6's at the truck to help you get the boat onto the truck. Some large, brawny types of helpers would be good.
Back truck in; position the 2x6's; tie them together or nail a couple of 2x4';s to hold them in place; drive boat up as far as it will go; use the suggested come-along and rollers to move the boat all of the way up into the truck's bed.
Take her to the work place and slide her down the 2x6s and work there. When done, reverse the procedure.
a post here, and maybe on a local fishing network might net you a trailer to use for a few hours, free of charge.
Obviously, it is easier said than done. I've done a lot of work at boat ramps, usually on my trailers.
Also, Harbor Freight sells an inexpensive, put-it-together yourself boat trailer.