We use the COLEMAN ROADTRIP which comes in very handy two wheel tote. Packs up great and the tote has pockets for all the accessories...
We still use the 1LB propane canister which work great and adds to our back-up propane canisters on hand to run our emergency heat needed when using the MR BUDDY heater when camping off the power grids..
My trailers both came with the outside grills and they were given away along time ago - never opened them up. I was not all that excited of have the grill setup on the side of the trailer. I am sure they are all safe and all but we feel it is much better to have the grill a few feet away from the trailer wall.
One of these days I will make up a nice small table to use where the wall mounted grille attached to the trailer.
I got my my present COLEMAN ROADTRIP back in 2008 - Easy to clean up with the water tray in the bottom to catch all of the greese drippings. The different GRILLs you are using hoses down real quick when you are done using them.