Perceptive forum discussions on Strap on dildo:

Body Safe Strap Ons for Shower Sex?
So, I know water based lube is all but useless in the bath/shower, and that you can't use silicone lube on silicone toys, so what material is best for

Harnesses?
I'm shopping for a silicone dildo with balls, as well as a harness. The Johnny Vixskin measurement and detailing both appeal to me but a reviewer...

Change of category, I want a strap on, gf thinks it is too bdsmish
I want to get my gf to get a strapon. I don't like the videos where the talk is all 'yes mistress,' I just want a strapon in my ass to get my prostate...

Strap On Vibrators
I'm looking for something with the same functionality as the Waterproof Remote Control Venus Butterfly, but I haven't been able to find something of..

strap-on dvds
Looking for a quality NON femdom or sissy strap-on dvd. One where the guy actually enjoys it. Has an erection and orgasm. Suggestion?????

Most of the harnessable vibrating dildos I've seen aren't too powerful, but you can feel them (especially for the giver, less so for the getter but still some when fully inserted). I know that Vixen builds all their vibe pockets deep enough that the vibrator doesn't get turned off when you thrust, and if you like the Silk you might want to try the Smooth Operator (link). If you're up to something much bigger there's always the Nexus Maximus or Feeldoes...

Tantus makes great dildos, but they tend to mount the vibrator so it sticks out a bit. This makes it easier to remove, but unless you can come up with a pad to cushion the end of the vibe it will tend to turn on and off with every thrust. Turning the vibrating bullet around might help.

It would be a bit of work, but pictures of the vibrating toys with the vibes installed would help people to answer these questions.