I am a HUGE fan of blind-spot mirrors. I immediately stick one onto the driver's side mirror on every car I buy (unless it already has one integrated into the mirror).
I like the round ones that are angled and rotate. This way I can stick one on and rotate it to both completely cover my blind spot and aim partly down so I can see the rear tire and painted lines when backing into a parking spot. No need to set the mirror to dip when in reverse! Like these:
They're $3 for a 2-pack.
On a side-note... If your goal is to see straight back behind you, then the more you angle your mirror inwards, the more that straight behind location creeps out farther and farther across the mirror glass. With the mirror set WAY too far inward, you can see straight back behind you at the very far outside edge of the mirror, at the point in the mirror glass physically farthest away from the truck. Why this is interesting is because when towing a big, boxy camper, adjusting the mirrors a bit too far inward actually produces a very usable rear view because you've pushed the viewing location farther away from the Ridgeline. Coupled with a blind spot mirror, you still have fully functional mirrors that otherwise would have been pretty useless. This technique works pretty well with my 7' wide camper, at least. I'm not sure how well it'd work with an 8' wide trailer.