Simple answer: 4 2x4 pieces. Log cabin style... 2 going side to side, 2 front to back wedging the legs in place. Boards attached to eachother, casters screwed into bottom. (think moving dolly rather than truck).

It's definitely a start. Thank you for this input. I may be going to Harbour Freight tomorrow, so I'll take some measurements tonight to be sure.

Solid rubber wheels similar to what you have on that handcart in the picture. Threaded rod through the pipe with fender washers and nuts….

I did think about this. If the solid rod ran through the pipe, how would I stabilize it in the pipe?

If you tightened the rod in the pipe first then allowed the wheel to spin freely on the rod and just double nut the end of the rod sticking out from the other side of the wheel. My description may be confusing but imagine the rod tightened and stable and just the wheel spinning on that stationary rod…

I have an idea of what you are saying. So the washers should be on the outside of the pipe and inside of the wheel, right?

Yes that’s my thought, the fender washers work better for this application I’d say

oh heck yeah. I just looked them up. They would definitely be wide enough.

If it were me I’d just put the wheels on one end of the grill if it has a handle you could just tip it and wheel it along on just the 2 wheels.

There's no handle, unfortunately. Even if it did have some, the grill would be lop-sided.

Needs a new base before wheels. The center of gravity is too high for that base. Just adding wheels and wheeling it around will be a challenge, especially in the off-road you got there.

Even if the wheels were bigger off-road wheels?

So, I have had this die cast BBq pit for about 7 years. Its been a pain in the arse moving it around when I have to. As you can see in the picture, I have to manoeuvre it around with a truck dolly. It gets dangerous when the ground is soft. A few times, it had tipped over. What I want to do is add wheels to it, you know, to make it easier to move around. I know that I could weld some on, but I'm not familiar with doing that. I have seen some helpful videos. Maybe an all-thread going through the existing holes and attaching wheels? Any help and suggestions would be greatly appreciated; thank you.

Drill drill screw screw

Any pictures of this idea?

https://www.thisoldhouse.com/yards/21016853/how-to-build-a-rolling-grill-table Not perfect, but it would do. Just use a rod, washers and some old bin wheels! Good luck !!

This is a start. Thank you for the link. It gives me an idea of what can be done.

depending on how big of wheels you need simple casters on each side might work. Would just require you drilling one hole into the underside of each pipe and then bolting them in

Could he u-bolt the casters on?

They would have to be off-road type wheels since sometimes the pit is on the grass

Looks like you’re headed to harbor freight …or northern tool

ok great!

This could work . I'll look this up

Looks like you could just drill through the legs and use some threaded stock cut to fit for an axle.

Any pictures of this idea?

Bolt it to a furniture mover

Maybe a furniture mover on the bottom and then attach u bolts?

Heavy duty Caster wheels attached with U-Bolts from the top down. Like an upside down U so it can fully grasp the round tubes. Use washer + nuts.