Do you want to plan the building site and then place the trailer site?
Usually a well is dug where the drilling company thinks there is water. Then lines are run to the building site and the trailer. Or they could run to the trailer with plans to run off those later for the building site.
Same with the sewer. Run the lines to the trailer with plans to run to the building site later. Tell the septic company what your plans are.
If trailer will be temporary then it seems logical to run to the building site.
If you do not plan to later remove the trailer then it would depend on you state/county septic laws.
Invasive plants are Earth's way of insisting we notice her medicines.
Everyone learns what works by learning what doesn't work.
This may not work in your area, but if you can drive a sand point, you'd have a well for a few hundred dollars. It requires relatively rock-free soil and water within 25' of the surface.
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First, you drop a couch from the plane, THEN you surf it. Here, take this tiny ad with you: