First of all, Tacoma tow ratings range from 3500 to 6800 lb. As a general rule of thumb, it's good to keep your trailer at no more than 80-90% of max. Payloads go up to 1440 lb but not all are like that for sure. So get the exact specs on your specific vehicle before choosing a trailer.
The higher end of the tow rating will get you in a 16-18 foot trailer. So you have a lot of options.
For full timing, IMHO the main thing you WON'T find in a small trailer is a comfortable place to sit. Dinettes suck for that, and the other option is the bed. Consider getting a used trailer (with careful inspection) and don't be afraid to modify it to suit your needs. A single recliner with a straight chair and small work table is a good combo for a single person.