My roadside area was screwed shut along one edge but it was obvious it was also hinged. The screws are gone now and a latch installed below out of site. This gives me access to the tank flush device which plugged up with paper. Drilling larger holes solved that issue but still did little to clean the sensors. Those things drive me crazy.
Solution: Installed another sprayer on the passenger side right over the sensors. They get sprayed off every dump cycle and have had no issues at all.
As for seeing behind things, in some cases you can stick a small camera in the area and snap some photos. I used to inspect tough places in my airplane this way.
Myron & Deborah
08 HR Endeavor 40 SKQ
2016 Ford F150 Limited V6 with Ready Brake
Aluminator tow bar, Demco base plate