you know I did build my zetros on the HG-P604 chassis and it is a 6x6 with the 2 speed transmission also there are a pile of metal upgrades for that platform also the price point is really low
https://www.aliexpress.com/item/High...460.0.0.CxCLmE
I have had a lot of fun with that truck it pulls my 10lbs of single drop trailer with no issue.
the only complaint I have is it has a really bad truning radius
and here it is as a hauler
lights and sound is just a module
https://www.aliexpress.com/item/Orig...7df712f0&tpp=1
just one example how ever there is a couple of other options as well
https://www.aliexpress.com/item/HG-A...cdfe83f1&tpp=1
https://www.aliexpress.com/item/1-10...cdfe83f1&tpp=1
not a fan of MOA but
https://www.aliexpress.com/item/1-10...cdfe83f1&tpp=1
https://www.aliexpress.com/item/WLto...AbTest=ae803_3
hope some of this is helpfull