2wd can push things around quite easily you just need a good scoop/wedge and some grippy ish wheels and if your intending to go 4wd then i would recommend going for lipos because there isn't much difference in price and the nimh packs just cant put out enough amps to run 4 drill motors properly
t made a huge difference when i swapped over to lipos in night fury but i kept scruffy on nimh as it was 2wd and if it got under other bots it had no problem shoving them around