A fleet that exists for six weeks
The defining constraint in agricultural logistics is that the peak fleet and the baseline fleet are different sizes by a large multiple.
Fitting hardware to vehicles used for one season is difficult to justify, and removing and refitting it annually is worse.
Consent-based SIM tracking fits this shape: approximate position on a hired vehicle for the weeks it is engaged, with no device and nothing to remove afterwards. Owned vehicles that run year-round justify fitted tracking.