You didn't mention what engine or chassis the RV has, but I guess its a front engine gas model. It depends on how much access you have above the radiator. If the radiator is drained, it's likely you could move it with a little help. It's not welded in place, just bolts, so if you get it loose you can decide if it can be removed out the top. An engine lift might be handy.
If it does have to come out the bottom, you could probably make ramps or use jacks and jack stands to lift the front high enough to drop it out the bottom.
A lot depends on what's in the way of removal, but a cutting torch would not be on my list of tools for this job. Soak the bolts with lots of penetrating oil for quite a while before trying to remove them, In an '88 they've been there 28 years!