Having fooled around a bit with personal portions of expenses on the rental form, I believe you can enter both vehicles into one T776 and take 30% of the CCA, then go to the next T776 and input the same details, taking 30% of the CCA, again the next T776 will have the same documentation at 30%. This will use up 60% of the CCA, leaving 40% as personal, which is probably close enough that CRA won't bother you. You can only claim the actual fuel and repair receipts for rental expenses.
