Welcome to the forum, that looks like a fine coach.
You can compare prices of other used trailers here: Used Hi Lo Listings | Used RVs & Motor Home Listings | RVs.Oodle.com
I saw the same on there for $15900 but you will see that location can affect the prices. I bought a 2693 RD for 5K but the previous owner included everything (hitch, hoses, propane, cover, elec chords, the works).
Pricing for that unit seems reasonable to me.
Don't be concerned with HiLo being out of business, there are a couple of guys that were involved with the factory that are selling parts and service on these units, plus most everything that you will find on these trailers are industry standard equipment, excluding things like the lift mechanism and seal.
There are guys on here towing trailers from 1969, that's awesome. There are many from the 80's and 90's, including mine, and many many resorces on this forum about repairs and modifications to these trailers.
There are also many towing with a Tacoma whom I'm sure will chime in and answer any questions you may have on that.
I guess it all depends on what you want, if you want a spacious trailer that tows like a dream and that is neat as heck, this one may be for you. If you like it, buy it! You don't have to worry about quality or service.
Happy Camping and keep us posted!