I tried to get the FMM and the TIP paperwork started in order to save time at the border, the system works some times and sometime it is a total waste of time, I ended with an RV, a 5th wheel, a truck and a car all on the TIP and no FMM, still spent one hour at the border possessing the paperwork, much better than the 2 1/2 hours I had allocated for the paperwork.
Even the folks at the border related that the internet site is a waste of time, they have a lot of problems with the paperwork generated by the internet site, so sometimes it works other times it does not.
navegator