Should I fix up a reefer unit and resell it?

I have a Thermo King Reefer SB111. It is in respectable shape, don't know the year or the number of hours on it. I am in the process or repairing the engine to get it up and running again. It was a Marten unit as I can see some light coloring on the box where Marten looks like it was scraped off. Anyways, I was planning on trying to sell it after I got the engine repaired. I was also thinking about a new paint job, new tires and just general appearance fixing up adding air ride on it. Any recommendations? Should I just fix the engine and try to sell it or should I go the extra mile, would it be worth my time and investment? Preferably people who know about reefers and trucking? Thanks.