We at Burnaby Village Museum (in British Columbia, CANADA) built our own "A-frame painting cart many years ago based upon the photograph shown in "Museum Registration Methods" (Third Edition, Revised) by Dudley, Wilkinson et al. (1979) page 7. It has worked very well for us.
 
Tips:
  1. Cover the 'floor' of the cart with indoor/outdoor carpet which has short pile to lessen the risk of snagging delicate frames. (suggestion by the above book's authors). This also reduces slipping or shifting of the load.
  2. There is a ridge lengthways along both long sides of the platform of the cart to act as a lip to help keep items being transported from slipping off the cart.
  3. I suggest having some tie downs for items being transported lengthways along the side of the cart (like a glass company's delivery van with its rack on the side for carrying the sheets of glass). You (or your janitors) will find the cart useful for moving folding tables too. Elastic 'bungy' cords are suggested for moving tables though for art work a more gentle tie-down would be recommended. This advice is from experience, as we have had something topple off the side of the cart, though luckily it was just a folding table in a meeting room. Noisy to be sure, but no damage.
  4. Of the four wheels: at one end of the cart they are fixed, and the other end they swivel a full 360 degree (2400 mils).   The following is tongue-in-cheek :-)  You have a choice. If you are used to driving a car, you can push it with the swivel wheels at the 'front', or if you are more used to steering a boat (i.e. maritime museum staff) you can push it with the swivel wheels at the 'stern' (rear). They are centre (center) steer so no alterations are required for left-hand or right-hand drivers. Skill in 'parallel parking' or bringing a boat alongside a dock as the case may be is advisable.  It is recommended that you assign tall staff to operate it so that they can see over top of it as they push it. :-)

Colin Macgregor Stevens,
Curator,
Burnaby Village Museum,
Burnaby, BC, CANADA

-----Original Message-----
From: Museum discussion list [mailto:[log in to unmask]]On Behalf Of Kara J. Hurst
Sent: June 23, 2000 08:22
To: [log in to unmask]
Subject: Re: Cart to transport framed art (again)

Heather,

From all the helpful responses I've received from listers, it seems most museums construct their own carts, or buy "material handling" carts.   ... Kara J. Hurst
Registration Intern
Sam Noble Oklahoma Museum of Natural History