Welcome to the forum!
The one you describe is definitely one of the larger models, and may have been a modification or special production unit since it had 2 tables, and 2 chairs instead of a sofa. Others may chime in with a correction, but I'm not sure a model like that was a standard production model.
I believe the slide-outs have only been available since 2002 in the models 23ft or greater.
You might review the various Hi-Lo brochures that can be found on the forum main page under the red bar entitled "Library", and the click on the sub-forum "Hi-Lo Brochure" and you can look at a number of different floor plans. Here's a link to that collection of brochures:
Hi-Lo Brochure - Hi-Lo camper travel trailer forum
Good luck and come back with any questions.