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Anyone towing a 24’ boat with a MB ML350 or GL350 or GLE350 or bigger engine?

@ZGhost give you my update for towing SR230 for my GL450 V6 biturbo, it was running good until 6 hours of driving near Mammoth lake around 7,000 foot elevation, suddenly it won't have anymore power past 40mph on a 4th gear only and doesn't increase even though I already floored the accelerator. I end up pulling over and switch to Nissan Frontier V6 RWD due to possibly overheating my engine due to high elevation, turbo charged is not helping and not able to pull the boat on elevation anymore and notice temp gauge on MB GL450 2015 was on the highest level and open the engine and coolant is full and rested for 5 mins, remove the boat and able to run no problem with 6 passengers without a boat. I was not so impressed with 2015 GL 450 V6 turbo at this time, I'm thinking about getting Ford F250 superduty for towing 8 hours or more on my boat. Higher elevation is a problem probably, but going home with MB GL450, I notice that I can use the manual transmission lever on the steering wheel side and I can proper control my gear on higher elevation, turns out no problem at all, but using manual transmission lever on higher elevation, MB GL450 fired up no problem.
 
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