I wouldn't want to live in a camper in the winter for 2 weeks much less 30. Have you looked at maybe renting a house with some coworkers?
Any local houses for sale? Buy, rent out rooms to your fellow workers.
The Data Center project has already slicked up any available short-term housing to buy for project completion. I guess you could see who might be finishing their part of a project and maybe be able to work out something with them.
I've owned 2 campers. A 26' with 1 slide and currently a 38' w/2 slides. I use them starting mid-May to Mid-Sept. On a chilly weekend the heater runs a whole bunch to keep it in the 60's and will go through 1/2 of a 30# tank, minimum. Mine has zero skirting. If I were going to have a camper over the winter, I'd want a ~100Gal+ sized tank and a contract with a propane provider to check and fill it often, minimum weekly. It'd be a semi full-time job managing multiple 30# or even 100# tanks on your own.
If I were going to stay in Aberdeen for a project in Ellendale I'd want to be @ the Ramkota on the N side of Aberdeen just for ease of getting in/out of town. I'd try to avoid anything on Hwy 12 as it's quite congested and can REALLY be a pain during harvest or stock-sale days when semi traffic is heavier.