The sump on my x-flow is the lowest point, and it is about, what 18" behind the front tire centerline. What usually happens for me on speed bumps is that front tires go up, over, and down, then the sump skims (or worse) the speed bump.
For speed bumps I can't get around, or over "creatively", I carry two pieces of 2x6 about 3' long in the boot, put them on the far side of the speed bump in line with the front tires. Keeps the front end higher while the sump clears the speed bump. Gives onlookers a laugh, but has saved me a couple of "take the long way around" side trips already.