I found that Corgi makes 1:43 scale "future" Batmobile vehicles that can fit in wonderfully when stripped and repainted, links:
http://www.amazingcomics.com/istar.asp?a=6...ass%3DDiecas%26
http://www.amazingcomics.com/istar.asp?a=6...ass%3DDiecas%26
http://www.amazingcomics.com/istar.asp?a=6...0%26pos%3D40%26
(a note - Robin's "Red Bird" car in hand is much sleeker and appropriate than the pic would lead one to believe.)
All of these I bought for about $8 each.
I also have a pair of the "Thunder Cycles" line that Hot Wheels made a while back that looked the part as well, specifically, the "BFUSION" (cannot find a pic) and "SHOKBLADE" link:
http://cgi.ebay.com/HOTWHEELS-THUNDER-CYCL...0QQcmdZViewItem
In the US, Discount Hobbies has a few resin vehicles that could work well from the Grendel line: http://www.megaminis.com/Merchant2/merchan..._Code=GRE-10069
http://www.megaminis.com/Merchant2/merchan..._Code=GRE-10068
And overseas, Old Crow and GZG make great "utility vehicle" stuff as well:
http://www.oldcrowmodels.co.uk/25vehicles.htm
http://www.gtns.co.uk/store1/commerce.cgi?...id=1723169.4727
My contribution:
(cool stuff here too)
http://www.pig-iron-productions.com/
Forgot to mention Alpha Forge's "Salvage Dog" as a utility truck, just put one of those together and primed it the last two days...
http://www.alphaforgegames.com/catalog/ite...323/2204593.htm