It doesn't tell you anything specific about the springs but it gives you an idea of what the springs are designed for.
Front HD Linear will be correct for you. You need HD due to the winch bar, when you get under about 220lb/in the springs stuggle to retain their ride height over the longer term. You would need to ask Dobinsons what they have spec'd at, but in the early days many companys were specing a lighter but long spring to retain a soft long travel ride but it wasnt a good setup as they wouldn't sustain ride height and at the other end of travel the front prop was interfering with the removeable Xmember. You can work around the Xmember, but not the soft springs. Nutshell - look for 220-230lb front spring rates, not lower.
On the rear, it tells you that it is a stiff spring, but how stiff is stiff because it doesn't tell you the spring rate, i just tells you the spring is designed so for a Disco2 that always has an additional 200kg in the boot. The variable springs can be setup in a a lot of different ways depending on what they're trying to achieve and you would have to ask Dobinsons also how the variable rate has been setup. Some are variable because they use an increased spring rate to increase the ride height and in some cases the lifted HD spring is shorter than standard, or they're running a longer shock and they need the stiff short spring to be longer, so at the installed length the variable rate is inactive and compressed - it may only be 1 or 2 coils, but in this setup it is purely to get a stiff short spring to have an increased spring rate in a spring that is longer. The other variable rate setup is running a softer spring rate at its installed length and then it undertakes a spring rate change after a certain amount of compression. So for example with my blue Disco, I designed the springs so that they have a rate of 300lb/in and then after 25mm of compression from unloaded the spring rate increases to 340lb/in. Nutshell, no probs with variable rate springs, they allow the spring to do more than a linear, but you need to ask Dobinsons how theirs are setup.
Feedback on the Dobinson springs has always been pretty positive. The brand often seem to give a bit more lift than expected as well.
By the way, I think you will find the ride isn't affected too much by increased spring rates, you will mainly feel it via the bumpstops when you hit them, so the lift and an increase in rate doesn't always mean it rides stiffer. Where you will feel it most is from the shocks, so pick your shocks really carefully.
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