QUOTE: That said, I don't plan to use them in my campaign but what the hell? If someone whats to allow the use of mechs why should they not be allowed to? Are we to specify in the vehicle design rules 'You can build any type of vehicle BUT Mechs'... ENDQUOTE
I hate to say this, but if (as the debate here and elswhere on these discussion boards has tended), Traveller is not the rules systesm, but at least also a background, then IMO yes, because Mech's just don't fit the 3I.
If T20 is not going to have either the Traveller rules, NOR the Traveller Canon background, then why call it Traveller (and why do you have to pay MWM?!
). Quite seriously, if subsequently there is interest in a d20 Hard SF game, using T20 as the core and doing a supplement for variant technologies and settings (Stutterwarp, CJ Cherryh's FTL drive, etc) go for it. But including such variants as Warp drives, Hand Blasters and Mecha in T20 seems to me to ignore the coherence of vision that is the primary appeal of the Imperium background.
The point of appeal of the enduring game settings (Glorantha, Tekumel, the Imperium, Jorune) I would argue is that they are rich and coherent. I don't believeanyone runs games perfectly to canon in any of these settings (and trying to is the biggest flaw of many tekumel and Glorantha games) but there are lines beyond which the material ceases to fit. Mecha, in the sense of 3m+ humanoid vehicles, really seem over that line for the canon Traveller universe. Battledress (i.e. 3m- armoured suits you wear) do not and addditional info on them should inspire a lot of the mecha fans.
Or put more simply, Rimrunners I could always see adapting into a Traveller Universe game, not Transformers