When we bought our camper we knew would would upgrade both truck and camper eventually. We made sure to get a camper we could pull with old truck but really wanted to just get started so that we could learn enough to figure out what we wanted. Well, we wound up seeing exactly what we wanted but hadn't upgraded truck yet. We couldn't buy the new camper on an awesome deal because we didn't have enough truck yet. I bought the new new truck very quickly after that, and now can't buy a new camper for a while... but I still have the old one.
So, if you are new to campers, I might advise you to get what you think you can get by with for a while and that you can pull for a while. Then start camping, and truck shopping.