I see nothing wrong with offering 2 different size dogs, most major burger joints offer more than 1 size burger so why not more than 1 size dog? I offer both 8/1’s and 5/1’s. I figured the bigger dog would appeal to the 20 some year old guys but it actually has been more middle aged women that buy them. I guess in their minds they don’t look so piggish cause it’s only 1 hot dog to fill them up vs 2 regular dogs. I also offer a smoked sausage. I do agree with Billy about a hot sauce, you may want to think about celery salt to. I have it on the cart, not alot ask for it but it is nice to have when they do. If you’re looking to sell to alot of the tourists from the states then people from the Chicago area will want the celery salt. Also New Yorkers will want Sabrett cooked red onion sauce if you can get it. But as I mentioned earlier, you’ll make adjustments once you start getting customer requests.