We replaced 6 fixtures with LEDs but only half of the bulbs. We find that with the right LED we only need 1 side of the fixture on at any one time. If we really need more light, on very rare occasions, we use both sides (a LED and an incandescent).
I made a rookie mistake with the first bulbs I ordered from China - I didn't check to make sure what base was on my bulbs. You need to know what your bulb's base size is and if it is single or double contact (would guess all should be single contact). I sold the wrong bulbs to a buddy at work who wanted to try LEDs and his trailer used the type I ordered by mistake.