I've ridden my cargo bike with 26" wheels around my fields, and the 2" tires cope with johnson grass clumps adequately. I imagine a suspension would help even more, possibly fat tires. I haven't ridden any bike in Texas fields, but I used to hike around them on band & ROTC excursions. I think the molehills are worse here than in Texas, but things could have changed. We don't get prarie dog or amadillo holes. I have a geared hub motor I installed on the front, where the battery is.
If you are tall, 29" or 700 cc tires would help even more evening out the bumps. Definitely you want a selection of lower speed sprockets. My bike goes down to 32:32 which is 1 mph, with 3 front & 8 rear sprockets. The 8 speed chain lasts longer than thinner versions with 9 or 11 speeds in the back. 48 tooth rear sprockets on MTB are useful for mountain climbing, which I would not imagine you would do in Texas East of Odessa. Throttles are handy for uneven speeds off road.
The magnum navigator is a 27.5" bike with a front suspension and long chain life 8 speed rear cluster.
https://www.magnumbikes.com/product/magnum-navigator/ Magnum is a bit more expensive than some brands like M2s, but has dealers that would be responsible for maintenance if there was an electrical bug. The navigator has a rack for a small collection of fence tools. Also a throttle. I think they were asking $2300 list?
If you want to carry more, magnum & m2s have stretch cargo versions with geared hub motors, not as small as mine. I carry sometimes 8' boards, tee posts, or water pipe with my yubabike, using a loop of string off the handlebar and a 18"x36" aluminum angle frame on top of the kiddie car seat rack on my bike. I've carried a 6000 btu air conditioner, I imagine a hay bale would fit crossways, too.