Very good question. Guess it depends on the test drive. I suppose if weather conditions were right and traffic conditions were right a 100 mile test drive may get the attention of the driver. Just how long is a test drive? 5 miles, 10 miles? Around town? Maybe jump on a freeway or interstate for a few miles in nice weather? How many people are out looking for MHs in bad weather with 30 mph cross winds and drive a 100 miles in heavy truck traffic? I held a commercial license and drove a lot of MCIs and Crowns. I took my MH out for about a 10 mile test drive on a 2 lane hwy @ 65 mph. I thought it drove pretty well. On a multi lane interstate during windy conditions driving several hundred miles I started to notice the sway problems. Did I absolutely need anti away, rear trak, and safesteer? Probably not. I could struggle along and be totally thrashed after driving 100 miles. OR, I could add those items and make my driving a pleasant experience. I think you will find the older MHs that have less height drive better. The manufacturers went withh higher MHs with more under storage which caused more wind load and of coarse shorter wheel base to save money. JMHO