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thrust is distributed load which is the same as acting on the center more or less. 40lbf @ 4ft is ~160 ftlbs bending load at the base. Not sure if pipes are rated for bending loads, if so you want it to be above 160ftlbs. The mounting method looks pretty like it distributes the moment pretty well, so not sure if you need to do additional calculations there.
If there is no bending moment load for the pipe available, it will be a relatively simple calculation involving the beam bending equation and the moment of inertia of the pipe which will be easy to calculate vie wikipedia level engineering
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