Pop-Up Truck Camper

I was surprised by the number of responses. I do have a truck a '01 Ram 2500 CTD Long Bed. I bought it when I was married to tow a 5th wheel but like I said I'm now single and the 5th wheel is more than I can handle. I would like to travel still but I must admit at 74 I'm not to much into off roading it. I just want to see more of this beautiful country of ours but I'm also low on money and just about every camper I've seen is to expensive or weighs to much. I've seen some pop ups that I could afford and would easily fit on my Ram. I really didn't think Pop-Ups were that popular but now I see how they would be very popular when off roading and/or presently own a 1/2 ton truck.
Thank you all for the incredible information
Gary