As above, you'd be pretty unlucky to snap springs in either front or rear suspension!
Most suspension problems are damping failure. The oil/gas seals fail and oil/gas pisses out and your suspension goes all bouncy. This is problematic on rear shocks as often they're manufactured so they can't be repaired. On front forks it's not normally an issue - Oil seals are normally generic parts cheaply sourced from any engineering stockists, and easy to replace.
If your front suspension is too soft, you could try preloading the springs by sticking washers/2p-coins under the caps at the top. Or sticking in heavier oil to harden the damping. Good forks, like on proper dirtbikes, often have adjustable damping and spring preload.
I wouldn't worry so much about front suspension failing, most of the extra weight when your touring is going on the back of the bike, so it's the rear shock(s) that need looking at. Good quality shock is nice, but most important thing is to have a spring hard enough for the weight you're carrying - Carrying too much weight for the spring(s) is what is likely to induce shock failure.
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