And I saw someone have a wheel work loose and go spinning off a trail near Silverton.
Point being that spacers add a point of failure. That may be acceptable in exchange for what you gain, but it doesn't sound like you need them.
And although they are sometimes hard to find in the right size, there's also the option of wheels with different offsets.
If the offset is the same as what the spacer adds, you are creating the same leverage on the wheel bearings and the same risk. The spacers themselves don't fail, the bearings do from the extra leverage. Just to be clear.
__________________
Sportsmobile-less.
"A job worth doing is worth doing at least twice."