question about towing with a new Diesel- any brand

The question I have is how many of you tow your trailers as soon as you take delivery... As apposed to those who wait the 500 or 1000 miles to break in ??

If a new vehicle comes in sooner or later than expected and you have a trip planned , what do you do ? cancel the trip... tow with it ...??

I have always been in the break it in like your going to drive it camp and that has worked so far..