That sounds very high. I would guess 1k max and even then you'd have to be cognizant of the motor overheating
. You shouldn't be putting anywhere near that much weight on a small boat windlass anyways. Use the engine/weight of the boat to break the anchor
free off the bottom. The windlass should mostly just be picking up the dead weight of the anchor
and whatever chain/rode is still out and off the bottom. In typical anchoring
depths, that's maybe 200-300 lbs or so.
Those physical dimensions seem about right. The actual mounting footprint is long in the fore/aft and fairly narrow across.
If you didn't know, the casing is all bronze. I like the look of the units - a sort of no-nonsense "get 'er done" combined with a certain grace.