I am far from an expert, but I have not seen slide in campers being just a 1000lbs, even popup seem to be more than 1000lbs. When I was looking for a used camper I looked at many many campers and anything lighter, such as a popup were non existent in the used camper market in my area. Are you looking for something with a bathroom, kitchen area, how will you use the camper?
Even a 1000lbs camper probably would require and for safety reason need to have actual tie downs, I have seen where some guys use ratchet straps for temporary measures, as in getting it home or something along those lines.
Finally, Id go at this cautiously having weight limits and the handling limits in mind in what ever your needs and wants are in your camper choice.