This recent Diesel Crew post puts an interesting spin on a deload - not just reducing your load, but swapping out for a light workout and extra emphasis on recovery/rehab work.
Strength Training Deload
If you are doing a regular deload, this is a good article to mine for ideas (or just follow to the letter).
If you aren't doing a regular deload, why not? If you are working near your capacity, you'll need time off to rest and recover.