The TorkLift GlowStep Revolution # TLA8003 measures 7-1/2" between steps and yes, they are consistently all the same. The only way they would not be is if you adjusted the landing gear on the bottom, which you can do to ensure they are perfectly stable on any terrain. view full answer...
The Lippert Alumi-Tread Manual Pull-Out Step - Quad # LC432698 that you referenced does indeed feature a drop/rise of 8 inches, while the Lippert Alumi-Tread - Triple # LC432696 has a drop/rise of almost 9 inchces (8-3/4 inches to be exact).
The 4-Step model will feature an overall distance of 49-5/8 inches from the top of the mounting bracket to the bottom of the last step. The 3-Step model has a distance of 38-3/4 inches for this measurement. The ideal entry height for the 4-Step, which... view full answer...
The Curt Short-Arm Weight Distribution System with Sway Control - Trunnion Bar - 15K GTW, 1.5K TW # C17422 has bars that are 28-3/8 inches long. Other standard weight distribution systems have bars between 32-33 inches long. view full answer...
Your cutout is just a little too big for the standard RV entry doors like the part # 295-000019 that you referenced. It would need to be just 1/4 inch smaller in height and width to fit. Best option might be to try and modify the opening to make it a little smaller to use something like this. We do not have any oversized options currently. view full answer...