New answers tagged suspension
On Trek 4300 you have RST Gila fork which is cheap and simple. You can't really lock it completely, just pre-load the spring to maximum. I'd say you should not worry about it - the internals are very simple and can't really be damaged easily: this is no oil/air fork. It has a steel spring and some rubbers to work as dumper. And most likely the juddering you ...
I have ridden the Cane Creek Thudbuster post on my hardtail mountain bike, my beach cruiser, and my city bike for well over a decade with superb results. Saddles stays equidistant from the pedals regardless of compression amount.
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