I don't know anything about the tie downs, as I don't use them. So I am not able to provide any guidance there. But I did notice you were interested in the Slide models with the Lance campers, but none of the Slide Models with Artic Fox? Is that right?(I am not that familiar with AF model numbers)
If you were interested in the slide models with Artic Fox, I would say you have a superior product for Cold season use with that manufacturer, over Lance. I have a Lance, and would get another one. But, I would prefer the seals that Artic Fox uses around their slides, over the one Lance does.
Welcome to the TC forum and IMHO you won't go wrong with choosing a Truck Camper.
Safe travels.
b