Most of you are missing the point. When things are bolted together, the idea is to squeeze them together tightly enough that they don't move. Bolt shear is not what keeps them from moving, the friction between the two parts is what stops the sliding.
If the force on the joint exceeds the friction force, the parts move in relation to each other, wearing off a little bit of material, making the next slide easier and so on. Eventually the movement starts elongating holes and hammering the bolt and unscrewing the nut. The end result is the joint comes apart.
The way to prevent this is to use the best bolts possible and as many bolts as possible. In the case of base plates, substituting Grade 8 bolts torqued to 100 ft lb (for 1/2 inch bolts) with hardened flat washers instead of the supplied Grade 5 at 60 ft lb increases the clamping force by 50%.
And then there are the split lock washers supplied by Roadmaster. About 30 years ago, a NASA study reached this conclusion:
The lockwasher serves as a spring while the bolt is being
tightened. However, the washer is normally flat by the time
the bolt is fully torqued. At this time it is equivalent to a solid
flat washer, and its locking ability is nonexistent. In summary,
a Iockwasher of this type is useless for locking
Another study showed that the split lockwasher was actually worse than no washer at all and made the joint deteriorate faster.
That's why you won't see any split washers on Cars, Trucks, Airplanes or almost any modern equipment. The combination of proper bolt selection and hardened flat washers are far superior to split lockwashers. And you won't see anything in your owner's manual about retorquing all the fasteners on your car every 3,000 miles. Why the RV industry persists in using split lockwashers is a mystery.
They best thing anyone can do is throw away all the grade 5 bolts and nuts and lockwashers provided with your baseplate and replace them with Grade 8 nuts and bolts and hardened flat washers and torque them properly.