We only purchase 1 tons for our electricians. But the parts and wire tend to be at least 500 lbs more per van. I've never weighed the tech vans verses the journeyman's vans but my guess would be in the neighborhood of 500-1000 lb difference. I believe you just get updated springs, shocks, etc. that can handle the additional 1000 lbs payload. That's the only main difference. For us, it ensures that we will get at least 10 years out of the van without the need to replace springs, shocks, etc. We buy Chevy Express vans. So I would say tech's could easily get away with 3/4 ton.