Paying for content on the web is anathema to most and not without reason. I've only done it once before, for EncyclopediaBrittanica.com (worthwhile too). Trails.com, however, (which was recommended to me by a friend) is certainly more than just a rip-off. (I don't know about "Trailsresource.com.")
They've paid for copyright on apparently thousands of guidebooks for hiking, biking and paddling and then allowed you to search them very easily by text and/or using maps that allow you to zero in not just on a State but on a specific spot. Separately, you can also look at and download survey maps for anywhere in the US (and maybe elsewhere).
As I said, this isn't worth the nearly $50 annual charge (but $4 per mo. isn't exactly extortion) for someone on this board who hikes only in NEngland and eastern NY, but if you travel some, in circumstances where you may have a few hours or a day free here and there, it may be worthwhile. (For me, it has been about break-even in value so far.)