Hi,Muggs. I have a long history of towing race car trailers with motorhomes. Started with a couple of class C and graduated to a Monaco diesel pusher, and had both open and enclosed trailers.Now have a Vegas and aluminum open trailer - no race car any more, but still tow hot rods....
I agree with you- you can't beat a motorhome at the race track . Other really nice thing is an enclosed trailer - protects and stores the race car, and you can carry all the gear and spares with the car. Only reason I point this out is : if you ever want to graduate to an enclosed trailer it will really effect your decision to upgrade.
Also agree with you that the Vegas 24.1 is an excellent tow vehicle - have been impressed myself. I agree wheelbase and overhang are big factors. My class Cs had same power, but longer rear overhang, and were nowhere near as good. When I went to an enclosed trailer, they were downright dangerous in crosswinds. With an enclosed trailer, I was close to 8000 pounds. Reason I went to a diesel pusher - you can't beat that for towing !! I would recommend looking at a used diesel rather than a used gas if you are upgrading to a heavier trailer.
As far as added systems - I don't think that is a big factor. Issues I have had are much the same on all motorhomes I have had. My experience is you will have a lot of work with ANY new motorhome working out the bugs and personalizing it. That said, my Vegas - one of the first made ( early 2015 ) - has been the worst motorhome I have ever had , but it is finally coming around. I do understand they have improved the later ones. Probably the best course of action is buying a lightly used one from a meticulous owner who fixes everything before you get it ...
, but used could also go the other way ...:eek
Good luck with the decision. As you go bigger with a gas motorhome, you will be getting the same motor with more weight, so you are probably going backwards for your race usage. In a diesel, watch engine size- some of the cheaper, smaller diesels don't have much towing capacity. In the Vegas you have a pretty good unit - but nothing beats an enclosed trailer and diesel pusher !