Economic viability of light freighters?

Refer to: <a href="/node/10204">Light Freighter</a>.<br /><div><br /></div><div>at 1.5 cargo units I was wondering if this class of ship is economically viable?</div><div><br /></div><div>Suggestion: the Eleanor Mores had an external attached landing stage that it could leave behind as an automated environmental sample collection thing.</div><div><br /></div><div>What if this was just a Cargo add on to HS 3 assault scout type ships?</div>