We have an RV 7. There seems to be 2 basic types of aftermarket T/wheels double and single fork. The double looks real draggy compared to the single. And they both look more draggy than vans t/w. Being that the down tubes are round and the large bolt that holds the wheel on. I need some honest feed back on anyone who has one or both kinds of the 1 or 2 fork assemblies. I like our cruise speeds and really don't want to lose any. Round in the wind multiplies resitance by 4x. So that is my concern, any anwsers or real world numbers would be appreciated. Thanks Dean