https://www.thormotorcoach.com/outlaw-class-a/
Are you dead set on a 5th wheel? My folks have been traveling the country with a Thor Outlaw motorhome hauling their HD trike and towing a Jeep. They love the layout and its ease to get in almost any place including my driveway. I believe the cost will be about the same as buying a dually and 5th wheel.

 

 

We have a good 3ft 5ver toyhauler. No slideouts. Master is seperate. Back 2/3 of trailer is open. When bikes are out, we have lots of space for guests. Easily take another couple and not be too tight. And no slideouts that will cause issues.

 

So, you are looking at a 1 ton dually and a 38 ft trailer. Your total cost, over a couple of years is going to be a minimum of $120,000, reaching toward $180,000, depending upon how you equip each part of the unit. Having been through the toyhauler thing, I can offer this: 1. stay around 32 feet. It doesn't seem like much difference, but in tight spaces and heavy traffic, 6 feet can be a world of difference. 2. If you plan to spend a lot of time, in the trailer, equip it with everything you want or need. And don't forget to ensure you have lots of storage. 3. Slides make a huge difference in living space, (they also add to cost and weight). At least have a slide in the main living area. 4. Outdoor entertainment/kitchens are very useful, as is the "patio" options for the rear ramp. They increase usable space, when parked, without increasing size. 5. probably most important, shop, shop, shop. There are huge mark-ups in RV's do searches for dealers in neighboring states. Find a unit you are really interested in, then enter the brand and model in your search. You may find as much as $20,000 difference in price, for the same unit.
Another thought. For the same $120,000, you can buy a nice 30, (or so) feet Class C, pull you bike on a trailer and still have enough left over to buy a nice small pickup, if you need one.

 

Love my 5th wheel toy hauler. Love being able to disconnect and have a vehicle to cruise around in. Mine is 33 feet long and has room for me, my wife and 3 kids along with 2 grandkids. Disadvantages...gas milage is horrible. I get close to 7 mpg if I keep it under 70 MPH. I'm hoping to take the rig to Sturgis next year. But that's going to be a very expensive trip.

 

 

 

I've had all of them, bumper pull trailers, 5th wheel toy trailers and a motorhome with an enclosed (boxed) trailer been RV'n for 25 years. Currently have motorhome, enclosed trailer and a bumper pull toy trailer. Pro's and cons to all. Drive a motorhome pull a trailer with just bikes, no transportation then for anything but fair weather, unless your okay riding in the rain. Don't like rain, bigger trailer that fits small car & bikes, but bigger fuel tank, so less stops. A 5th wheel toy trailer gets the bikes there and allows mobility via the truck. Down side no bathroom no kitchen: must pullover for either. It really comes down to what your going to use it for? Easyist maybe truck and toy trailer. Only ever going to haul a bike, or 2, get a toy trailer with a garage (walled off) area as it separates toys and smells from living area. Just going to do pavement driving and parks and no off road... motorhome... ? On and on.. based on your usage.. Buying good gently used stuff, best value, hassles getting a personal loan, New, easiest to put you in a loan (Typically higher costs) ...