AHHHHHH Now it comes together.
I (and almost 75% of the people on this forum) have electric slides. There are a "few issues" with them, but by and large, they are reliable and function well for most of us. I wouldn't be "afraid" of electric slides, and if you can save $15K, that's a lot of gas for that generator and the tow vehicle to take you camping for a number of years with the savings !!!!!
Good Luck