Hi Sinecure,
The Heartland website shows the Elkridge as a Full-Profile RV, with higher ceilings, but it's priced toward the low-end of the Full-Profile offerings. Usually, all floorplans of any given model will be built on the same manufacturing line, so in general, the quality will be about the same. Naturally when you take weight out, some of the materials may be a bit different, and some features may be a little different. As with most RVs, the design point is based on light to medium usage. It's not considered a full-time trailer and using it that way may result in more wear and tear sooner than you'd like.
There are a couple of things that you should discuss with the dealer - having to do with it being on the dealer lot for a couple of years.
I'd suggest you have them re-caulk around the roof, and around the lights along the roof line. Caulking is supposed to be checked several times per year and maintained as necessary. I doubt there's any dealer who does that on their inventory.
I'd also suggest that you have them re-pack the bearings. Sitting in the same place for a couple of years is probably not good for the grease that was there from the manufacturer. They may want to pump grease into the EZ Lube zerks, but I'd suggest you insist on a hand repack, and be there to see it done. A lot of people have concerns that using the zerks incorrectly can blow a seal, resulting in bearing and brake problems.
Check the tires. If you've been doing research, you'll know that most people aren't comfortable with Towmax 16" tires. Plus, they were likely manufactured several years ago. If that's what's on the trailer and you want to make a change, now would be the time.
Do a very careful inspection of the interior before negotiating the purchase. If prospective customers have been walking through the unit for a couple of years, there could be cosmetic issues that need to be addressed. These are typically the dealer's responsibility and wouldn't be covered by the warranty because they're not manufacturing defects. Anything that needs to be fixed should be fixed to your satisfaction before signing the papers.