for the power tiller.
you could use a maxx bulkhead mounted to the rear end of your emaxx with a suspension arm on it, then maybe have a custom rear tower and mount a rc winch on it. search around on rccrawler.com some guy was making these and they were very powerful, like hooked the winch to his desk and picked up a 1/6th scale crawler that had to weigh 15 pounds.
just an idea
edit- heres aquick drawing using paint so its 2nd grade quality but paint is all i have on my laptop