Unfortunately you're in the minority these days, at least in the eyes of manufacturers. It appears that dual cabs are what sell so they're what get made.
The lack of useful tray sizes in utes is one reason I ended up going for a van for something to put my dirt bike in - unlike most of the utes I was finding within my budget it actually has a load space long enough to fit the bike with room to spare and low enough to roll it in easily.
If you're running ducting into your server/switch cabinet I've thought before that it could be interesting to have an exhaust setup that you can switch between venting the excess heat directly outside (in summer) or back into the main house (in winter).