Rock, I haven't dug into this, but it seems that MoHo's use different door locks than Trailers. Trailer's not meant to travel occupied and MoHo is, so a more robust lock is required. That might mean the TT owners didn't get the Terrible TriMark. The one my brother changed looked like this
This one is for MoHo, notice the extra retaining parts
And the price is more than double. Just clicked into it. Lordy it's a TriMark, T507. I forget if it's the bad boy or another model. Bet YOU know...
Our Jayco has an RV lock and a residential deadbolt. I lock only the deadbolt, and even then I don't lock the coach without a deadbolt key AND a Ford key to get into the cockpit of the Class C.
