There is zero consistency in the construction of any travel trailer. One person with the same make and model may have a 2" gap. Another with the same make and model none. I would take the time to remove or cut open the underbelly area underneath the area where you'd like to place the screw and visually check the area where the screw will exit. There could easily be pex tubing, wiring (12v or 120vac), ducting, not to mention the tank itself, in the way. IMO, the time messing with the underbelly is a small price to pay vs. the alternative---unless you're just feeling lucky--lol! Good luck!
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