Iowa Code Title VIII. Transportation [Chs. 306-330B] § 322C.12. Semitrailer or towable recreational vehicle retail installment contract--finance charges

a. Class 1. Any new semitrailer or towable recreational vehicle designated by the manufacturer by a year model not earlier than the year in which the sale is made, an amount equivalent to one and three-fourths percent per month simple interest on the declining balance of the amount financed.

b. Class 2. Any new semitrailer or towable recreational vehicle not in class 1 and any used semitrailer designated by the manufacturer by a year model of the same or not more than two years prior to the year in which the sale is made, an amount equivalent to two percent per month simple interest on the declining balance of the amount financed.

c. Class 3. Any used semitrailer or towable recreational vehicle not in class 2 and designated by the manufacturer by a year model more than two years prior to the year in which the sale is made, an amount equivalent to two and one-fourth percent per month simple interest on the declining balance of the amount financed.