There are many variables to answer your questions:
1) What are you planning to have RUNNING or ON in the TT when plugged in at home?
If you are using it to keep the fridge on the night before you leave, then YES.
If you are using it to run A/C, Television and some lights then run the microwave, you will need to have a 30 amp breaker and outlet installed specifically for your TT.
2) How long of extension cord are you using to run the TT?
If you are using it to keep the fridge on the night before you leave and the cord is less than 10 feet, you will be OK.
DO NOT use this cord if you are running the A/C and other items. You will find the cord will get warm (if not hot) to the point it could melt.
Running the A/C alone on a 15 amp extension could cause your breaker to trip. You have line loss of power an amps when you use an extension cord and the 30 to 15 adapter plug.
To answer you in short, you should really have a dedicated 30 amp service for your TT. No more problems or issues.
HAPPY CAMPING!! :D
Daryl and Sandy
2013 Eagle 314BDS
2014 Ford F150 Platinum, 4 x 4 Crew Cab with Ecoboost