Back to drawing board.... help me decide...

I don't think you have enough horse power to tow a toy hauler and the boat !

Another possible option, perhaps from left field: a truck camper and a trailer as appropriate for the toy(s) du jour. You might (probably would) need a hitch extension and with it the corresponding reduction in towing capacity.

I don't understand what you're asking.
You want to haul a 800lb Lang, had to look it up, 800lb BBQ for camping...... and? Something else at the same time?
Want to use the pickup?

Well the good news is you can tow that boat behind a 5th wheel in Michigan if you have the Recreational R endorsement on your drivers license. You can not tow the boat behind a TT. So if your taking the boat you need a 5th wheel. Now the problem is finding a 5th wheel Toy Hauler to fit you, your family, your stuff and your toys into that doesn't exceed the payload rating of your 2500. Finding the 5th wheel is pretty much up to what you like and need.


Oh, and one other thing, there is an overall length restriction but I don't off hand know what it is. So that pretty much is going to limit your 5th wheel size.