We are pulling our 3670 from northern WV to Louisville this week and plan to spend a night enroute in a Walmart parking lot. Other than putting water in the fresh water tank, what precautions should we follow? Can I extend any of the slides with the 3670 still hooked to the truck, if the unit is reasonably level? Anything specifically I should not do? Just hoping to use good judgment and get input from those of you who do this on a fairly regular basis.