I also have a '14 TS and I use a funnel with a flexible spout to add oil and coolant. The coolant cap accessible outside is only to the coolant recovery tank, the actual pressure cap is underneath the access panel just forward of the oil dipstick/fill and coolant recovery tank caps. You have to take the access cover off and pull up the coolant fill hose with the pressure cap attached if you have completely drained the coolant and need to refill the system. For normal service checks you just verify the level in the recovery tank via the external (should be blue) cap.
Changing the oil and fuel filters is a little messy, they are accessible under the unit inside the access door. But not hard to access in my experience.
2014 Seneca 37TS
Toads: 2014 Ford Explorer Sport or 2013 Ford Focus ST