I'm gonna give it to you straight, i don't see the need to extend.
Keep a grease gun handy, when you fill the tank grease the bearings. Make sure you have the tools to change a flat, and before you leave perform a dry run on both wheels.
You don't want the lugs rusted, so remove them and just a dab of oil or grease on the threads, and re-install the wheels.
Believe me if you make wide turns and don't go over 65 mph you will be fine.
You will be staying overnight at a motel / hotel ? Just make sure of the wide turn, say into a gas stall. I looked for flying J gas stations they have great food and the tractor trailer drivers use it.
Flying J seems to be the gold standard for clean bathrooms my wife says, always clean, and like i said food was great and the price not to bad. T / A gas stations were second best we found on our travels around the country.
I know me telling you don't be so nervous , but when you finally get to your new home you will take a second and think " Why was i so nervous it went so well ". I have been there done that.
Good luck !