I said 'most' as not all aren't cheap. There's the G63 AMG 6x6 clone from Japan that's actually a Suzuki Jimny, while our favourite folks from Russia made a poor man's 6x6 version of the Lada Niva. If these two cars don't suit your taste, there's one on eBay right now that might fit the bill: a Mercedes ML 6x4.
Listed at £19,995, this converted Mercedes ML might very well be the most affordable six-wheeled Mercedes for sale right now. We specifically used "six-wheeler" as this Mercedes ML is actually a 6x4, with the working wheels presumably would be the original axles.
The Mercedes ML 6x4 is located in Nottingham, UK, but only a few details are found on its listing. Its title may say that it's a Mercedes ML AMG 6x6 but it's actually not since it's powered by a 3.2-litre V6 of the ML 320, unlike the AMG version with its 5.4-litre V8. What it has, however, is an AMG body kit and six 18-inch AMG alloy rims.
Though there are no details on how the conversion to six wheels was done, the Mercedes ML 6x4 on sale looks neat in photos but more detailed images would make that official.
China Factory 4x2 Tractor Truck
Interestingly, the listing also mentioned that the engine has been converted to LPG. We're not sure how that works but if you're interested to save on fuel with your six-wheeler, you might want to contact the seller directly on eBay. Who knows, you might land a good deal for this Mercedes.
Dump Chassis, Cummins Engine Tractor, Cummins Engine Truck - Automobile Holding,http://www.shacmanchina.com/