Moving from the basement to the Penthouse suite eh...
You will pay a fortune for sliders that have sufficient reach and weight rating mate.
Keep in mind that the way they rate a lot of slide racks is tricky and they will not hold the rated weight at full extension.
If it was me I would be more tempted to pod mount the tent and put the panels sideways on a slider with maybe 1 over the other and the top one slides forward over the cab or whatever.