First find how many months the loans last: 20 years * 12 months/year = <<20*12=240>>240 months
Then divide the cost of the house by the number of payments to find the monthly payment before interest: $480,000 / 240 months = $<<480000/240=2000>>2000/month
Then do the same thing to find the monthly payment before interest on the trailer: $120,000 / 240 months = $<<120000/240=500>>500/month
Then subtract the cost of the trailer payment from the cost of the house payment to find the difference: $2000/month - $500/month = $<<2000-500=1500>>1500/month
#### 1500