Quigley used to do straight axle but it’s been a number of years since. Boulder also does them and still does I believe. Not sure what set up Weldtec is going with.
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2015 Chevy Express 3500 Duramax
w/ Quigley 4x4 & Agile Fox shocks
Sold 2005 E350 Chateau
Quigley with Agile RIP, 6.0 PSD
Re Texas builds -- depends a lot on what the original purchaser spec'd. Mine was done in Texas and has a good furnace, but it was ordered by someone who lived in Wyoming. Remember that most of these vans were customized to one degree or another, so you can't really assume too much about equipment.
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N8SRE
1990 E-250 Sportsmobile w/ penthouse top, converted when new by SMB Texas.
My daughters 6.0 equipped 2001 Chevy has 364K miles on the original engine. Uses only 1 quart of oil between 5K miles changes. Starts and rattles a little just like it did with 50K miles. The 480LE automatic transmission has been rebuilt once. She averages 14 MPG everywhere.
It's hard to beat an Chevy LS based engine for power and longevity in any platform. That's probably why it's has to be one of the most used engine for engine swaps on any brand of vehicle.