TT Weight limits: theory and reality

I'm going to speak to the F150 EB only mainly because it's the truck I pull with and have researched the most. Going over the GMVWR by 10 to 20% in this truck, is normally not going to put you in any danger. The trucks can handle it both structurally and mechanically and this has been proven many times over by the sheer number or people that do it on a regular basis; well into high mileage without any problems what so ever. However with the F150 if you are going to pull over your GMVWR (or even close to it), there are a few weak points I recommend addressing on this truck. The first one is the tires - especially if you have 20" rims and the stock Pirelli Scopions. These are not a good tire to tow on and they barely meet the GMVWR rating of the truck. I would replace them with an "XL" or C class tire that is designed to carry extra weight. Also with the EB you will experience vibration in the rear end when accelerating from a dead stop as you get close to your max cargo or tow weight. This is caused by the twisting of the rear leaf springs due to the extremely high torque the EB produces at low RPMs. To solve this you will need to install a leaf spring helper or an active suspension system such as the Roadmaster Active Suspension (between $200 and $400.00). Both have made a world of difference in the way my truck handles heavier loads.