Rick, I have a lot to say about carts and have even thought about designing and manufacturing my own because they all suck a bit, one way or the other. I own three different ones.
Whatever you do, don't go wider than 24 inches, too tough to get through most hotel 'staff-only' hallways that are packed with their crap. 36 inches long is way easier to make tight turns with but you can make them with a 48 inch long cart as well, just takes more precise maneuvering.
I find the R&R's to be highly overrated and very cheaply made. I own the R&R 16. Here is a link to my looooong review.
View: https://www.youtube.com/watch?v=CLhcr6Upc5M
I don’t like carts that you have to be careful with or they’ll break, like the R&R. The old Milwalkee I bought at the Home Depot years ago is still solid like a rock. I bolted on a piece of 3/8” plywood to the deck when I got it so things wouldn’t fall through. After a few years, I switched out the tube tires for some non-flat ones and had to change the swivel castors once but it is SOLID. I move the heavy stuff on that one. Here is a link:
Milwaukee 800 lb. Capacity 2-in-1 Convertible Hand Truck-CHT800P - The Home Depot
My Quiklok is great but you have to make sure the handle is braced against your gear if ‘pushing’ it up an incline or you will break one of the welds which happened to me. The R&R is not any better in this regard. The handle’s folding mechanism is great as is the extendable system. These carts were originally made in Italy which is why I bought one. However, when mine arrived, I found out they were being made in China now, like mine. Here is a link:
QuikLok BW600E Band Wagon Equipment Hand Cart
You may be happy with something like this:
http://www.amazon.com/dp/B0189NHRJG?psc=1 They are tough and fold up. If you find you want it bigger, just cut a ¾” piece of plywood to your liking and bold on the handle and wheels. That is always an option.
I checked out the Gruver at the Guitar Centre but the display was broken which didn’t leave me with a good impression. Also, it can be used very short or very long, there is no 36 inch length which I use a lot since it fits in those wheelchair lifts.
This one, built in a ‘monster’ version would be ideal. I love how even the wheels fold flat; genius! However, it is just too small.
http://www.amazon.com/Magna-Flatform-Capacity-Wheel-Folding/dp/B002TITK8O/ref=pd_sbs_328_3?ie=UTF8&dpID=418WqUWLAdL&dpSrc=sims&preST=_AC_UL160_SR122,160_&refRID=0V2MTHEKHBEAE5JQCF7Q
Let us know what happens!