Anybody know what the biggest r/c car or truck available? I've seen some custom stuff with go cart motors and weedeater motors. Just curious whats out on the market.

I assume by saying "Available" you mean toy buy, as in a kit or RTR type vehicle. In that case I would say 1/4 scale is the largest.

If you're talking something you make yourself, the sky is the limit, I've seen plenty of Radio controlled 1:1 cars & trucks.

Here is company with some cool large scale stuff.

http://www.molzermoweryracing.com/index.html

Also, CEN Genisis is a huge truck.

http://www.cenracing.com/main.html

new era makes the 1/4 scale monster truck or they used to not sure if they still do, they sold for lil over 4,000.00......
www.neweramodels.com (http://www.neweramodels.com)