If the employer had an accountability plan, they would require you to complete documentation supporting your use of the money they advanced to you, such as requiring you to submit a receipt for the cost of the rental.
Also, in effect you rented the trailer to the company since you got paid for the use of it.
So, it sounds like it is either rental income or reimbursed employee business expenses that weren't a part of an accountability plan. In either case, it would be taxable, even though not reported to you as such. If you reported it as rental income, you could deduct expenses such as gas and maintenance on it up to the amount of money they paid you.
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