Kidoo
It sounds like you have a plan in place and based on your thoughts you would rather have one without slides. Based on that I would buy one without slides. If you were buying new one might say that you loose something on resale. Since you are buying used you are the one to benefit from it. Most of us buy with slides because we like the extra space. We went from no slides to two and now to four. In the 12 years of having slides we have not had a problem with them. However that is not to say that they may not be a problem. It is your money and you know your needs so do what you want to. Enjoy whatever you decide on!!!!