I recommend using the Karrier ST235/80R16 Radial Trailer Tire # AM10248 on your Lionshead wheels for your 2020 Grand Design Momentum 25G trailer. These tires are rated for 3,500lbs of weight per tire with a load range E rating at 90psi and the speed rating M(81mph) you are wanting. The tire also carries a 5 year warranty with 1 year worry free guarantee. Wheel manufacturers do not give a maximum psi rating for their wheels the way tire manufactures list their tires.
Using a Load Range... view full answer...
I checked with B&W and when set up and ready to tow the lowest point of the system is 9" below the bottom of the trailer tongue. From the ground to the bottom of the B&W Continuum item # BW28FR is going to be a different measurement for each trailer. I can't give you that exact measurement because I have no idea how far off the ground your trailer's tongue is.
I have linked a review video below so you can see how to get this system set up. view full answer...
If you are measuring for clearance on your Grand Design 28G Momentum for the install of the SumoSprings kit part # SS26MV you'd need to measure with the weight of the trailer on the ground. I wouldn't go so far as to load the trailer down as much as possible but how it would be most of the time. This kit comes with spacers so that you can make the spring sit taller so that you can acquire the desired 1/4 to 1/2 inch of preload or they can be cut down shorter as well. view full answer...
To add a hitch to your 2021 Grand Design Momentum 25G toy hauler you are going to want the Adjustable Width Trailer Hitch Receiver item # C13702. This frame mounted hitch can be bolted or welded on and will fit as long as your frame isn't wider than 51".
This is a class III hitch with a 2" receiver and is a universal fit. There are no custom fit hitches for your trailer. You will want to verify what your toy hauler's capacity is but this hitch can provide you with a 500 lbs tongue weight... view full answer...