The Hidden Engineering Behind a Simple RV Door Lift

Joe Faison — Wed, 08 Jul 2026 06:47:54 +0000

When I first started working with gas springs, I assumed the solution was simple: if a door feels heavy, use a stronger gas spring.

It turns out that's usually the wrong approach.

Whether you're designing an RV storage compartment, a machine enclosure, or a custom cabinet, the amount of force isn't the only thing that matters. In many cases, mounting geometry has a much bigger impact on how the system feels to the user.

The "more force" misconception

A common assumption is that doubling the force will make a door twice as easy to lift.

In reality, a stronger gas spring can create new problems:

The door may become difficult to close.
It may "pop" open too aggressively.
Hinges and brackets can experience unnecessary stress.
The motion feels less controlled and less predictable.

A lift-assist system should balance the weight of the door—not overpower it.

Mounting position changes everything

One of the most interesting things I learned is how sensitive gas springs are to mounting position.

Moving a mounting bracket or hatch struts by even a small amount can completely change how the door behaves throughout its travel. The goal isn't simply to hold the door open; it's to create smooth, consistent movement from the moment the user starts lifting until the door reaches its fully open position.

That often requires testing several mounting locations before finding the right combination.

Designing for real-world use

Mechanical systems rarely operate under perfect conditions.

Outdoor equipment has to deal with vibration, temperature changes, dust, moisture, and thousands of opening and closing cycles. A design that looks good in CAD isn't always the one that performs best after months of real-world use.

That's why prototyping is difficult to replace. Small adjustments that seem insignificant on paper can dramatically improve usability.

Simplicity usually wins

One lesson that keeps coming up in product development is that users don't notice complexity—they notice reliability.

If a door opens smoothly every time, stays where it's supposed to, and closes without fighting the user, most people never think about the engineering behind it.

Ironically, that's probably a sign the design is working exactly as intended.

I'm curious how other engineers and product designers approach lift-assisted mechanisms. Have you found that small geometry changes made a bigger difference than increasing component strength?

Author's note: I work on mechanical lift-assist systems at HatchLift, where we design gas spring solutions for RV and utility applications. Most of these observations came from testing and refining real-world installations rather than relying solely on theoretical calculations.

DEV Community: Joe Faison

The Hidden Engineering Behind a Simple RV Door Lift