Short DP's Handling

I was on I 95 in Fla. the other day when I came up to a Tiffen Breeze (28-32 ft) as I passed him he almost came into my lane. As I watched him in my rear view mirror he was all over the road and had a difficult time staying between the lines. It was not windy. I have read on here many times about the wheel base to length ratio having to be .50 or higher for a good ride. I suspect it is more than this ratio. I suspect it has more to do with the weight being evenly distributed on all four tires. It just seemed to me that with the eng in the rear the front end would have less weight on the front tires making for this white knuckle ride. Many on here report that their short MH,s ride well. I am interested in shorter MH's but would be very disappointed with this type of ride. I was wondering what others did to obtain a stable ride that have shorter MH's. Front end alignment tricks, suspension, weight distribution etc. Also would a 32 ft gas Class A be more stable than a 32 ft DP?