It's too bad that you are not able to get the trailer that you really wanted.
I will however applaud your decision to put legality and safety ahead of your personal desires. As I indicated in some of our other talks, you likely would have been able to hook up and go, but that was not a 'for sure' thing, more speculation from experience. It also would have meant that you would have to monitor each and every change you every made to ensure you didn't go over a rating for the reasons you explained above.
IMO that is not a very stress free and comfortable way to try and enjoy your travels.
I hope you are able to either of -
a) find a trailer that you really like and will always be inside the safe zone regardless of what normal changes take place.
b) find a buyer for your truck that allows you to get a tow unit that is correct for the trailer that you really want.
Which ever way it goes, enjoy your travels and take a bunch of pics for the rest of us to drool over.