Alikair, rent a similar size trailer for a couple of weeks, if it starts to feel like the walls are closing in on you after 9-11 days, then it is too small. I know in my own travels of up to about a month at a time our coach starts feeling a little cramped at around the 2-3 week point (2 weeks if my wife is along, 3-3.5 weeks if solo), livable, just a little small, a little too much of the same 4 walls. Enough to know I would want something larger for longer term travel.
2002 Safari Trek 2830 on P32 Chassis with 8.1L w/ 400 watts solar
2017 Jeep Cherokee Overland TOAD with Even Brake,
Demco Commander tow bar and Blue Ox base plate