Carrying motorcycle on rear

What exactly do you mean.."drags the rear end?'

Uh, no.
I've seen some people do some wierd things with a Prius, including using a G3 to tow a trailer.
Not a garden trailer.....but an RV TRAILER trailer.

I've never heard of one tail-dragging as a result.
How much does the motorcycle weigh?
It really sounds like you will be better off towing it on a small M/C trailer rather than on a carrier, and that solution would be cheaper and easier than trying to graft air-shocks or spring-helpers onto your car---to say nothing of being a heck of a lot more safe.

That's just a SWAG from what you've provided for info.

 

There's at least one PriusChat member who has posted pics of an airbag setup on his Prius. IIRC, there was mention of some modifications needed to install them.

Some questions come to mind. What is the load rating on your hitch? How much does your motorcycle weigh? Is it a 1.25" hitch?

If your backend is dragging, it would definitely be better to put your motorcycle on a trailer. That would relieve the hitch from most of the weight.

SCH-I535

 

Trailer would be better because you described all the weight is on the hitch. With a trailer you have tongue weight and tow weight.

 

Maybe this thread can help?

2010 prius towing? | PriusChat

 

With only a Class-I hitch, there isn't enough tongue-weight available for carrying a load heavy enough to require greater suspension.

 

^ The OP hasn't popped back up, but if he or she is tail-dragging, then I suspect that they've already exceeded the capacity of a C1 hitch....unless "motorcycle" meant "moped." This is tongue weight, which is entirely different than total weight.


Even then.
Even though a very diminutive motorcycle still weighs several hundred pounds, you're better off distributing that load on a trailer, than all on the hitch. A C1 hitch might be capable of more than you think.
From Wikipedia: Tow hitch - Wikipedia, the free encyclopedia

Class I – up to 2,000 pounds (910 kg) – light loads
Class II – up to 3,500 pounds (1,600 kg) – light loads
Class III – up to 5,000 pounds (2,300 kg) – larger loads (campers, boats, etc.)
Class IV – up to 10,000 pounds (4,500 kg) – larger loads (campers, boats, etc.)
Receiver-type hitches are typically offered with a square receiver opening of 1.25 inches (32 mm) (for Class I/II) or 2 inches (51 mm) (for Class III/IV/V). Some Class IV/V hitches are available in 2.5 inches (64 mm) opening sizes.


Me?
I have a C3 hitch (NOT on a Prius!) and I really wouldn't feel comfortable towing much over 1k with a 1.25 C1 receiver, but that's me.
IMHO a G3 ought to be capable of towing loads in that range for relatively short distances, with the proper equipment.
Yes.
I know that the G3 is rated to tow zero pounds. That's one of the reasons that I'm a G3 DRIVER and not a G3 owner.
However (comma!)
If you're trying to haul 500# bolted directly to the receiver, and airline pilots are squinting because your headlights are pointing up?
That represents a potential handling problem for your car IMHO.

 

The OP started another thread:

Need rear shock upgrade for hauling m/c around | PriusChat

I guess he didn't like the responses in this one?

 

OP = original poster, the one that started the thread/discussion.

The fact that you are using an adapter to use a carrier that is designed to be used in a higher class rated hitch should be the red flag here.

I posted in the other thread why doing what you are doing is a bad idea.

SCH-I535

 

That adapter cuts your tongue weight rating in half, which means that instead of exceeding the maximum tongue weight rating by 50 pounds, you are exceeding it by 150 pounds! What you are doing is VERY unsafe, and if the hitch fails, dropping the motorcycle into traffic at 80MPH, you are going to cause some serious damage!