Rim width is key. I wouldn't want anything wider than 225 (approx 8.8") on a 7" rim. And make sure you understand the height difference between 75, 70, 65 series tires. For example 195/75 will be the same width but 1.5" taller than your 195/65.
Your tires are only 25" tall. Way too short for a 1/2 ton truck. I'd go to 195/75 or 205/75. Is your speedometer accurate now? I'd bet it reads fast with those short tires, unless someone changed the speedo gears. If it does read fast, a taller tire will make it more accurate. You can do the math if you know indicated speed, actual speed (phone app), and various tire heights.
Click on the 15" box here to see heights of various tire sizes.
https://tiresize.com/chart/