If I'm following you, in most instances yes. But if the ramp is shallow enough you'd need to put the rear wheels in the water you may be in a bit of trouble because of mud and sediment accumulation on the ramp.
I actually used to pull a fair size john-boat with motor gas etc. with a ford escort. It actually did real well with it on the road, but it was tricky getting it and the boat without the front wheels breaking loose and spinning, but it always made it on its own.
doesn't seem that long ago that everything (except a handful of foreign imports) was rear wheel drive and folks managed just fine most of the time!
Friend of mine welded a hitch receiver under the front bumper of his International 2wd pickup. He backed the boat to the top of the ramp, reversed the truck and pushed it down the ramp. rear wheels stayed out of the water and muck and it was much easier to see what you were doing.