No engineer ever established that the tow rating for all gas burner MH's is 5,000 lbs. Towing capacity is determined by a number of variables. H.P., Torgue, weight of TV, Transmission, and etc. The towing capacity of one MH with a V10 could be 6k and another 5.5 k and yet another 5k. To be on the safe, one size fits all, side therefore towing capacity is universally rated @ 5k.Notice too that the towing capacity of a MH sporting a 2V V10 is the exact same as that of a 3V V10 regardless of the differences in sustained output. Would one care to argue that an engineer determined none of the mitigating factors affect towing capacity or that somehow when all the variables are calculated the magic towing capacity of 5k is always arrived at?