RJACK22- Very nice!!!!
A suggestion for lifting the water end of the ramps (and boat) for overnight-
Note: edited and design changed slightly since the original post- my late night design had some extra legs.
Join all four frame boards together at the water end with a 2 X 8. Buy two of the cheap plastic dock wheels (see pic of the ones from Overtons below) or some other inexpensive plastic wheel and mount them to the ends of two 8' long (length depends on the depth of water and amount of leverage needed) 2 X 6's. Temporarily support the frame in a near-level position, but with the water ends slightly higher than the bulkhead end (to allow for settling and the over center leg height). With the wheels firmly on the bottom, mark, drill, and mount the wheeled 2 X 6's to the sides of and near the ends of the two outer frame boards, using a single pivot bolt on each one. These "wheeled, pivoting, legs" will support the ramps. Add stops to the legs or the frame boards so the legs can only rotate from just past vertical (the over-center, locked, position) to 45 degrees or so in the opposite direction (depends on the depth of the water). Attach ropes that are long enough to reach a few feet past the bulkhead, to both ends of each leg. Note: if the bottom is very soft you may need two wheels per leg.
In operation you would sail up the ramps as you do now. Then, from the shore, pull the ropes to rotate the legs, one or both at the same time into the "over center" position (and level ramp position), then cleat off the ropes. If you make the legs long enough, there should be enough leg above the pivot to provide adequate leverage. To lower the ramps, you would pull on the ropes that are attached to the opposite ends of the legs, causing the legs to rotate past the over-center, up position, to a position where they no longer support the ramps and/or allow the ramps to settle into the water, to the lowest water level, or to any position you choose.
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12" dock wheels. $40 from Overtons
Aw, heck, as long as I'm providing my two cents-worth- why not attach some 2 X 8's, 10's, or even 12's in the horizontal position to the tops of the outer frame boards. These would act as "catwalks" (pun intended!

). It would add weight to your ramps, but make it easier to rig, etc. It should have little impact on the legs and each wheel will support 700#. Put some indoor/outdoor carpet or other material on the cat walks to keep them from getting slippery. With catwalks you may be able to eliminate the ropes and only need to push or pull the leg extensions to raise and lower the ramp, boat, and the added weight of your body.