I figured I'd give the XLT1 a try since that's what's in FineDesign's LST2. It got good reviews from RC Car Action. Actually 13lbs. 10oz is with the extra big joe tire w/rim centering the truck on the scale.
It probably weighs about 12lb 11oz. As for the over the tranny motor mount, nobody seems to make one. i was looking for something like this:
I guess I can make one. I'll try and fab something up this weekend.