The NBOMe series isn't known for strong body load. Is there some reason you're concerned about this aspect of the trip? I ask because if for example you've had a negative experience with psychedelics before that relates in some way to body load then it may be the case that you would have to confront that fear while tripping in order to prevent the anxiety about this aspect of psychedelics producing psychosomatic feelings of tension in the body independently of the level of body load inherant in the drug. That's just a hypothetical example, but does a reasonable job I think of explaining why past experience may be relevant to this topic.
If you haven't had an experience like that in the past and you're just being safe by researching various aspects of the NBOMe series before taking any, then firstly I commend you for doing it right, and secondly I would say generally to not be concerned about body issues with these compounds. They're pretty benign physically (and mentally in my experience) when dosed at safe levels. As some have reported in this thread, these drugs may be somewhat stimulating. I think this (as does pretty much everything about a psychedelic experience) really depends on the individual that is tripping though, as I have never noticed any particularly obvious stimulation, and I am pretty sensitive to stimulation thanks to having been addicted to coke a long time ago in a major way.
In comparison to ordinary PEAs though, and especially in comparison to tryptamines, which are known for producing a fair bit of 'vegetative effects' as well as psychosomatic body load, the NBOMes are pretty mild stuff.