Water is about 8 lbs per gallon - not 2.
My heavy 4x8 foot box utility trailer (800 lbs empty) has the axle located 44 inches forward of the back edge. I suspect the cg of the Hawk, which has an 80 inch long floor, is located forward of 44 inches from the back edge due to the overhang even when the water tanks are empty. The trailer's own empty cg being forward of the axle will help, too, especially if it's a heavy trailer. If the camper back edge is even with the back edge of an 8 foot trailer my guess is it you would always have a positive hitch load and it wouldn't try to tip when unhitched. Don't get in the camper if it's unhitched until the jacks are on the ground, though.
Assuming a 10 foot trailer has proportional geometry, the axle would be 55 inches forward from the back of the box or deck. That may be at or in front of the Hawk cg if the back edge of the camper is flush with the back of the trailer. I would be very careful to understand where the cg is if I was using a 10 foot or longer trailer and wanted the back of the camper at the back edge of the trailer.
If I felt I needed to know where the cg of my camper was for safety or to prevent property damage I'd measure it myself. There are several ways that could be done. If the OP needs help with that I can make suggestions.
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Yikes! Your are right and I was wrong...
I was giving the weight of one liter of water [2.2 lbs]; not the weight of one gallon @ 8.3 lbs...so yes, 26 gallons @ 216 lbs IS significant.....