Lead time depends on local inventory, trailer size, floor plan, features, transport distance, site readiness and approvals; an in-stock standard unit can move faster than a customized office.
Ask whether the proposed unit is truly available
An estimate based on a model family is not the same as a reserved trailer. Request the source location, condition, configuration and earliest realistic dispatch date for the actual proposed unit.
Compare the same office and site scope.
Give every supplier the real ZIP, use, size range, term, delivery date and setup responsibilities.
Site and approval work can control the opening date
Delivery cannot solve unfinished grading, missing power, restricted access or an unresolved permit. Track supplier work and property work on the same schedule so one does not wait invisibly for the other.
Give suppliers the date and the flexibility behind it
State the preferred occupancy date, the latest acceptable date and which features can change. A clear mobile office request lets providers offer an in-stock alternative without silently reducing the required scope.
Turn this answer into a useful supplier comparison
Record the decision that applies to the property, who owns it and when it must be complete. Connect that note to the proposed unit, delivery plan, access equipment, utilities, service and removal so an unanswered assumption does not return later as a change in price or schedule.