Oh yeah, we are 400 lbs and we tear up rear wheels on our tandem. Used a mavic tndme rim. similar to OP profile, sucked. Sun tandem rims, sucked. Every wheel was about one year 2,000 max. We ride other bikes too.
Finally I ended up using Velocity Deep V's (30mm high). Seem much stronger. Even use them on my singles as I'm 220 and thrash wheels. ow have 48 spoke Velocity deep V's front and back.