Much would depend on your father's personality and whether he would see this as an enjoyable adventure or an attempt to keep him out of the house.
Keep in mind that if he is not a RV camper, he may have little knowledge of how to use the facilities in the TT - not all of it is intuitive. I also see that there are advantages to this setup in that it gives additional privacy to both he and you, which we all enjoy at times, but it could create issues if he is not experienced in staying in a TT or he perceives that he is not totally welcome in the house.