One thing I have done with all my vehicles is replace the drain plug with a Fumoto quick drain valve. When it’s time to change the oil I’m old school, dino oil and new filter every 3K.
But whatever engine you use, there’s a Fumoto quick drain for your engine. Money well-spent.
For a Chevy 454: http://fumotousa.com/results.php?make=11&year=1998&model=4948&makeid=CHEVROLET&modelid=C2500++7.4L++V8
For a Ford 460: http://fumotousa.com/results.php?make=19&year=1998&model=13718&makeid=FORD&modelid=Econoline+Super+Duty+7.3L+V8
Remember to look for your ENGINE, not the model of your RV.
You can also buy these at Amazon but they don’t have the handy search function, theirs is less user-friendly. But it’s a way to avoid spilling oil or get it running up your arm into your armpit.
Here is what one looks like. Just a sample image, not necessarily for your model…