Put the trailer on site and get it approved for occupancy, one bedroom.
Then build your log home and move into the bedrooms, ect when you feel comfortable with them....just don't get "too moved in". When you're ready for final inspection, move the stuff out and pretend you've never spent a moment inside that wasn't involved with the construction.

Kitchen?
Toilet?
Those are in your trailer.

What I'm trying to say is you "live" in the trailer, but you and the kids "sometimes" camp out on the property in the general vicinity of the log house under construction. That should keep your wife from getting cabin fever so bad that she wants to trade you in.